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**-D**\ *xname*/*yname*/*zname*/*scale*/*offset*/*invalid*/*title*/*remark*
Give values for *xname*, *yname*, *zname* (give the names of those variables
and in square bracket their units, e.g., "distance [km]"), *scale* (to multiply grid values after
read [normally 1]), *offset* (to add to grid after scaling [normally 0]),
*invalid* (a value to represent missing data [NaN]), *title* (anything you
like), and *remark* (anything you like). To leave some of these values untouched,
leave field blank. Empty fields in the end may be skipped. Alternatively,
to allow "/" to be part of one of the values, use any non-alphanumeric
character (and not the equal sign) as separator by both starting and ending
with it. For example:
**-D**:*xname*:*yname*:*zname*:*scale*:*offset*:*invalid*:*title*:*remark*:
Use quotes to group texts with more than one word.
Note that for geographic grids (**-fg**) *xname* and *yname* are set automatically.
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