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<DIV ALIGN="CENTER">
<FONT SIZE="+3"><B>The Generic Mapping Tools</B></FONT></DIV>
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<DIV ALIGN="CENTER"><FONT SIZE="+3">
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</FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><!-- MATH
$\epsfig{figure=eps/GMT_covertext.eps}$
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<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><B>Version 3.4</B></FONT></FONT></DIV>
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<BR>
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<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><B>Technical Reference and Cookbook</B></FONT></FONT></FONT></DIV>
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<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1">
<BR>
<B>by</B></FONT></FONT></FONT></FONT></DIV>
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<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1">
<BR>
</FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><B>Pål (Paul) Wessel</B></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3">
<BR>
</FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><B>School of Ocean and Earth Science and Technology</B></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><B>University of Hawai'i at Manoa</B></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1">
<BR>
<B>and</B></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1">
<BR>
</FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><B>Walter H. F. Smith</B></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3">
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</FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
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<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><B>Laboratory for Satellite Altimetry</B></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><B>NOAA/NESDIS/NODC</B></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2">
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</FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
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<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><B>April 2001</B></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1">
<BR>
</FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></DIV>
<P>
<DIV ALIGN="CENTER"><FONT SIZE="+3"><FONT SIZE="+4"><FONT SIZE="+3"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><FONT SIZE="+3"><FONT SIZE="+2"><FONT SIZE="+1"><!-- MATH
$\epsfig{figure=eps/GMT_coverlogo.eps}$
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<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"></A>
<UL>
<LI><A NAME="tex2html789"
HREF="node1.html">Contents</A>
<LI><A NAME="tex2html790"
HREF="node2.html">List of Tables</A>
<LI><A NAME="tex2html791"
HREF="node3.html">List of Figures</A>
<LI><A NAME="tex2html792"
HREF="node4.html">Acknowledgments</A>
<LI><A NAME="tex2html793"
HREF="node5.html">The GMT Documentation Project</A>
<LI><A NAME="tex2html794"
HREF="node6.html">A Reminder</A>
<LI><A NAME="tex2html795"
HREF="node7.html">Copyright and Caveat Emptor!</A>
<LI><A NAME="tex2html796"
HREF="node8.html">Typographic conventions</A>
<LI><A NAME="tex2html797"
HREF="node9.html">1. Preface</A>
<LI><A NAME="tex2html798"
HREF="node10.html">2. Introduction</A>
<UL>
<LI><A NAME="tex2html799"
HREF="node11.html">References</A>
</UL>
<LI><A NAME="tex2html800"
HREF="node12.html">3. <B>GMT</B> overview and quick reference</A>
<UL>
<LI><A NAME="tex2html801"
HREF="node13.html">3.1 <B>GMT</B> summary</A>
<LI><A NAME="tex2html802"
HREF="node14.html">3.2 <B>GMT</B> quick reference</A>
</UL>
<LI><A NAME="tex2html803"
HREF="node15.html">4. General features</A>
<UL>
<LI><A NAME="tex2html804"
HREF="node16.html">4.1 <B>GMT</B> Units</A>
<LI><A NAME="tex2html805"
HREF="node17.html">4.2 <B>GMT</B> defaults</A>
<LI><A NAME="tex2html806"
HREF="node18.html">4.3 Command Line Arguments</A>
<LI><A NAME="tex2html807"
HREF="node19.html">4.4 Standardized command line options</A>
<LI><A NAME="tex2html808"
HREF="node20.html">4.5 Command Line History</A>
<LI><A NAME="tex2html809"
HREF="node21.html">4.6 Usage messages, syntax- and general error messages</A>
<LI><A NAME="tex2html810"
HREF="node22.html">4.7 Standard Input or File, header records</A>
<LI><A NAME="tex2html811"
HREF="node23.html">4.8 Verbose Operation</A>
<LI><A NAME="tex2html812"
HREF="node24.html">4.9 Output</A>
<LI><A NAME="tex2html813"
HREF="node25.html">4.10 <I>PostScript</I> Features</A>
<LI><A NAME="tex2html814"
HREF="node26.html">4.11 Landscape and Portrait Orientations</A>
<LI><A NAME="tex2html815"
HREF="node27.html">4.12 Overlay and Continue Modes</A>
<LI><A NAME="tex2html816"
HREF="node28.html">4.13 Specifying pen attributes</A>
<LI><A NAME="tex2html817"
HREF="node29.html">4.14 Specifying area fill attributes</A>
<LI><A NAME="tex2html818"
HREF="node30.html">4.15 Color palette tables</A>
<LI><A NAME="tex2html819"
HREF="node31.html">4.16 Character escape sequences</A>
<LI><A NAME="tex2html820"
HREF="node32.html">4.17 Embedded grdfile format specifications</A>
<LI><A NAME="tex2html821"
HREF="node33.html">4.18 Binary table i/o</A>
</UL>
<LI><A NAME="tex2html822"
HREF="node34.html">5. <B>GMT</B> Projections</A>
<UL>
<LI><A NAME="tex2html823"
HREF="node35.html">5.1 Non-map Projections</A>
<UL>
<LI><A NAME="tex2html824"
HREF="node36.html">5.1.1 Cartesian Linear Projection (<B>-Jx</B> <B>-JX</B>)</A>
<LI><A NAME="tex2html825"
HREF="node37.html">5.1.2 Logarithmic projection</A>
<LI><A NAME="tex2html826"
HREF="node38.html">5.1.3 Power projection</A>
<LI><A NAME="tex2html827"
HREF="node39.html">5.1.4 Geographical linear projection</A>
<LI><A NAME="tex2html828"
HREF="node40.html">5.1.5 Linear Projection with Polar (<IMG
WIDTH="25" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img2.gif"
ALT="$\theta , r$">)
Coordinates (<B>-Jp </B> <B>-JP</B>)</A>
</UL>
<LI><A NAME="tex2html829"
HREF="node41.html">5.2 Conic Projections</A>
<UL>
<LI><A NAME="tex2html830"
HREF="node42.html">5.2.1 Albers Conic Equal-Area Projection (<B>-Jb</B> <B>-JB</B>)</A>
<LI><A NAME="tex2html831"
HREF="node43.html">5.2.2 Lambert Conic Conformal Projection (<B>-Jl</B> <B>-JL</B>)</A>
<LI><A NAME="tex2html832"
HREF="node44.html">5.2.3 Equidistant Conic Projection (<B>-Jd</B> <B>-JD</B>)</A>
</UL>
<LI><A NAME="tex2html833"
HREF="node45.html">5.3 Azimuthal Projections</A>
<UL>
<LI><A NAME="tex2html834"
HREF="node46.html">5.3.1 Lambert Azimuthal Equal-Area (<B>-Ja </B> <B>-JA</B>)</A>
<UL>
<LI><A NAME="tex2html835"
HREF="node47.html">5.3.1.1 Rectangular map</A>
<LI><A NAME="tex2html836"
HREF="node48.html">5.3.1.2 Hemisphere map</A>
</UL>
<LI><A NAME="tex2html837"
HREF="node49.html">5.3.2 Stereographic Equal-Angle Projection (<B>-Js</B> <B>-JS</B>)</A>
<UL>
<LI><A NAME="tex2html838"
HREF="node50.html">5.3.2.1 Polar Stereographic Map</A>
<LI><A NAME="tex2html839"
HREF="node51.html">5.3.2.2 Rectangular Stereographic Map</A>
<LI><A NAME="tex2html840"
HREF="node52.html">5.3.2.3 General Stereographic Map</A>
</UL>
<LI><A NAME="tex2html841"
HREF="node53.html">5.3.3 Orthographic Projection (<B>-Jg </B> <B>-JG</B>)</A>
<LI><A NAME="tex2html842"
HREF="node54.html">5.3.4 Azimuthal Equidistant Projection (<B>-Je </B> <B>-JE</B>)</A>
<LI><A NAME="tex2html843"
HREF="node55.html">5.3.5 Gnomonic Projection (<B>-Jf</B> <B>-JF</B>)</A>
</UL>
<LI><A NAME="tex2html844"
HREF="node56.html">5.4 Cylindrical Projections</A>
<UL>
<LI><A NAME="tex2html845"
HREF="node57.html">5.4.1 Mercator Projection (<B>-Jm</B> <B>-JM</B>)</A>
<LI><A NAME="tex2html846"
HREF="node58.html">5.4.2 Transverse Mercator (<B>-Jt</B> <B>-JT</B>)</A>
<LI><A NAME="tex2html847"
HREF="node59.html">5.4.3 Universal Transverse Mercator UTM (<B>-Ju</B> <B>-JU</B>)</A>
<LI><A NAME="tex2html848"
HREF="node60.html">5.4.4 Oblique Mercator (<B>-Jo</B> <B>-JO</B>)</A>
<LI><A NAME="tex2html849"
HREF="node61.html">5.4.5 Cassini Cylindrical Projection (<B>-Jc</B> <B>-JC</B>)</A>
<LI><A NAME="tex2html850"
HREF="node62.html">5.4.6 Cylindrical Equidistant Projection (<B>-Jq</B> <B>-JQ</B>)</A>
<LI><A NAME="tex2html851"
HREF="node63.html">5.4.7 General Cylindrical Projections (<B>-Jy</B> <B>-JY</B>)</A>
<LI><A NAME="tex2html852"
HREF="node64.html">5.4.8 Miller Cylindrical Projections (<B>-Jj</B> <B>-JJ</B>)</A>
</UL>
<LI><A NAME="tex2html853"
HREF="node65.html">5.5 Miscellaneous Projections</A>
<UL>
<LI><A NAME="tex2html854"
HREF="node66.html">5.5.1 Hammer Projection (<B>-Jh</B> <B>-JH</B>)</A>
<LI><A NAME="tex2html855"
HREF="node67.html">5.5.2 Mollweide Projection (<B>-Jw</B> <B>-JW</B>)</A>
<LI><A NAME="tex2html856"
HREF="node68.html">5.5.3 Winkel Tripel Projection (<B>-Jr</B> <B>-JR</B>)</A>
<LI><A NAME="tex2html857"
HREF="node69.html">5.5.4 Robinson Projection (<B>-Jn</B> <B>-JN</B>)</A>
<LI><A NAME="tex2html858"
HREF="node70.html">5.5.5 Eckert IV and VI Projection (<B>-Jk</B> <B>-JK</B>)</A>
<LI><A NAME="tex2html859"
HREF="node71.html">5.5.6 Sinusoidal Projection (<B>-Ji</B> <B>-JI</B>)</A>
<LI><A NAME="tex2html860"
HREF="node72.html">5.5.7 Van der Grinten Projection (<B>-Jv</B> <B>-JV</B>)</A>
</UL>
</UL>
<LI><A NAME="tex2html861"
HREF="node73.html">6. Cook-book</A>
<UL>
<LI><A NAME="tex2html862"
HREF="node74.html">6.1 The making of contour maps</A>
<LI><A NAME="tex2html863"
HREF="node75.html">6.2 Image presentations</A>
<LI><A NAME="tex2html864"
HREF="node76.html">6.3 Spectral estimation and xy-plots</A>
<LI><A NAME="tex2html865"
HREF="node77.html">6.4 A 3-D perspective mesh plot</A>
<LI><A NAME="tex2html866"
HREF="node78.html">6.5 A 3-D illuminated surface in black and white</A>
<LI><A NAME="tex2html867"
HREF="node79.html">6.6 Plotting of histograms</A>
<LI><A NAME="tex2html868"
HREF="node80.html">6.7 A simple location map</A>
<LI><A NAME="tex2html869"
HREF="node81.html">6.8 A 3-D histogram</A>
<LI><A NAME="tex2html870"
HREF="node82.html">6.9 Plotting time-series along tracks</A>
<LI><A NAME="tex2html871"
HREF="node83.html">6.10 A geographical bar graph plot</A>
<LI><A NAME="tex2html872"
HREF="node84.html">6.11 Making a 3-D RGB color cube</A>
<LI><A NAME="tex2html873"
HREF="node85.html">6.12 Optimal triangulation of data</A>
<LI><A NAME="tex2html874"
HREF="node86.html">6.13 Plotting of vector fields</A>
<LI><A NAME="tex2html875"
HREF="node87.html">6.14 Gridding of data and trend surfaces</A>
<LI><A NAME="tex2html876"
HREF="node88.html">6.15 Gridding, contouring, and masking of unconstrained areas</A>
<LI><A NAME="tex2html877"
HREF="node89.html">6.16 Gridding of data, continued</A>
<LI><A NAME="tex2html878"
HREF="node90.html">6.17 Images clipped by coastlines</A>
<LI><A NAME="tex2html879"
HREF="node91.html">6.18 Volumes and Spatial Selections</A>
<LI><A NAME="tex2html880"
HREF="node92.html">6.19 Color patterns on maps</A>
<LI><A NAME="tex2html881"
HREF="node93.html">6.20 Custom map symbols</A>
</UL>
<LI><A NAME="tex2html882"
HREF="node94.html">7. Mailing lists, updates, and bug reports</A>
<LI><A NAME="tex2html883"
HREF="node95.html">A. <B>GMT</B> supplemental packages</A>
<UL>
<LI><A NAME="tex2html884"
HREF="node96.html">A.1 cps: complete <I>PostScript</I> en-/decoder</A>
<LI><A NAME="tex2html885"
HREF="node97.html">A.2 dbase: gridded data extractor</A>
<LI><A NAME="tex2html886"
HREF="node98.html">A.3 gshhs: GSHHS data extractor</A>
<LI><A NAME="tex2html887"
HREF="node99.html">A.4 imgsrc: gridded altimetry extractor</A>
<LI><A NAME="tex2html888"
HREF="node100.html">A.5 meca: seismology and geodesy symbols</A>
<LI><A NAME="tex2html889"
HREF="node101.html">A.6 mex: Matlab 5-<B>GMT</B> interface</A>
<LI><A NAME="tex2html890"
HREF="node102.html">A.7 mgg: MGD77 extractor and plotting tools</A>
<LI><A NAME="tex2html891"
HREF="node103.html">A.8 misc: posters, patterns, and digitizing</A>
<LI><A NAME="tex2html892"
HREF="node104.html">A.9 segyprogs: Plotting SEGY seismic data</A>
<LI><A NAME="tex2html893"
HREF="node105.html">A.10 spotter: backtracking and hotspotting</A>
<LI><A NAME="tex2html894"
HREF="node106.html">A.11 x2sys: Track crossover error estimation</A>
<LI><A NAME="tex2html895"
HREF="node107.html">A.12 x_system: Track crossover error estimation</A>
<LI><A NAME="tex2html896"
HREF="node108.html">A.13 xgrid: visual editor for grdfiles</A>
</UL>
<LI><A NAME="tex2html897"
HREF="node109.html">B. <B>GMT</B> file formats</A>
<UL>
<LI><A NAME="tex2html898"
HREF="node110.html">B.1 Table data</A>
<UL>
<LI><A NAME="tex2html899"
HREF="node111.html">B.1.1 ASCII tables</A>
<LI><A NAME="tex2html900"
HREF="node112.html">B.1.2 Binary tables</A>
</UL>
<LI><A NAME="tex2html901"
HREF="node113.html">B.2 2-D grdfiles</A>
<UL>
<LI><A NAME="tex2html902"
HREF="node114.html">B.2.1 File contents</A>
<LI><A NAME="tex2html903"
HREF="node115.html">B.2.2 Grid line and Pixel registration</A>
<UL>
<LI><A NAME="tex2html904"
HREF="node116.html">B.2.2.1 Grid line registration</A>
<LI><A NAME="tex2html905"
HREF="node117.html">B.2.2.2 Pixel registration</A>
</UL>
<LI><A NAME="tex2html906"
HREF="node118.html">B.2.3 Boundary Conditions for operations on grids</A>
</UL>
<LI><A NAME="tex2html907"
HREF="node119.html">B.3 Sun raster files</A>
</UL>
<LI><A NAME="tex2html908"
HREF="node120.html">C. Making <B>GMT</B> Encapsulated <I>PostScript</I> Files</A>
<LI><A NAME="tex2html909"
HREF="node121.html">D. Availability of <B>GMT</B> and related code</A>
<LI><A NAME="tex2html910"
HREF="node122.html">E. Predefined bit and hachure patterns in <B>GMT</B></A>
<LI><A NAME="tex2html911"
HREF="node123.html">F. Chart of octal codes for characters</A>
<LI><A NAME="tex2html912"
HREF="node124.html">G. <I>PostScript</I> fonts used by <B>GMT</B></A>
<LI><A NAME="tex2html913"
HREF="node125.html">H. Problems with display of <B>GMT</B> <I>PostScript</I></A>
<UL>
<LI><A NAME="tex2html914"
HREF="node126.html">H.1 <I>PostScript</I> driver bugs</A>
<LI><A NAME="tex2html915"
HREF="node127.html">H.2 Resolution and dots per inch</A>
<LI><A NAME="tex2html916"
HREF="node128.html">H.3 European characters</A>
<LI><A NAME="tex2html917"
HREF="node129.html">H.4 Hints</A>
</UL>
<LI><A NAME="tex2html918"
HREF="node130.html">I. Color Space -- The final frontier</A>
<LI><A NAME="tex2html919"
HREF="node131.html">J. Filtering of data in <B>GMT</B></A>
<LI><A NAME="tex2html920"
HREF="node132.html">K. The <B>GMT</B> High-Resolution Coastline Data</A>
<UL>
<LI><A NAME="tex2html921"
HREF="node133.html">K.1 Selecting the right data</A>
<LI><A NAME="tex2html922"
HREF="node134.html">K.2 Format required by <B>GMT</B></A>
<LI><A NAME="tex2html923"
HREF="node135.html">K.3 The long and winding road</A>
<LI><A NAME="tex2html924"
HREF="node136.html">K.4 The Five Resolutions</A>
<UL>
<LI><A NAME="tex2html925"
HREF="node137.html">K.4.1 The crude resolution (<B>-Dc</B>)</A>
<LI><A NAME="tex2html926"
HREF="node138.html">K.4.2 The low resolution (<B>-Dl</B>)</A>
<LI><A NAME="tex2html927"
HREF="node139.html">K.4.3 The intermediate resolution (<B>-Di</B>)</A>
<LI><A NAME="tex2html928"
HREF="node140.html">K.4.4 The high resolution (<B>-Dh</B>)</A>
<LI><A NAME="tex2html929"
HREF="node141.html">K.4.5 The full resolution (<B>-Df</B>)</A>
</UL>
</UL>
<LI><A NAME="tex2html930"
HREF="node142.html">L. <B>GMT</B> on non-<I>UNIX</I> platforms</A>
<UL>
<LI><A NAME="tex2html931"
HREF="node143.html">L.1 Introduction</A>
<LI><A NAME="tex2html932"
HREF="node144.html">L.2 Cygwin and <B>GMT</B></A>
<LI><A NAME="tex2html933"
HREF="node145.html">L.3 DJGPP and <B>GMT</B></A>
<LI><A NAME="tex2html934"
HREF="node146.html">L.4 WIN32 and <B>GMT</B></A>
<LI><A NAME="tex2html935"
HREF="node147.html">L.5 OS/2 and <B>GMT</B></A>
<LI><A NAME="tex2html936"
HREF="node148.html">L.6 MacOS and <B>GMT</B></A>
</UL>
<LI><A NAME="tex2html937"
HREF="node149.html">Index</A>
<LI><A NAME="tex2html938"
HREF="node150.html">About this document ...</A>
</UL>
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<ADDRESS>
Paul Wessel
2001-04-18
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