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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Scenery>
An optically thin blob centered on the origin of the coordinate
system, in flat space-time. Computation uses the spherical
coordinates.
<Metric kind = "KerrBL">
<Spin> 0. </Spin>
<Mass unit="sunmass"> 4e6 </Mass>
</Metric>
<Screen>
<Distance unit="kpc"> 8 </Distance>
<Time unit="yr"> 30e3 </Time>
<FieldOfView unit="microas"> 150 </FieldOfView>
In UTF-8 locales, "microas" may be written "µas".
<Inclination unit="degree"> 90 </Inclination>
In UTF-8 locales, "degree" may be written "°".
<PALN> 0 </PALN>
<Argument> 0 </Argument>
<Resolution> 32 </Resolution>
</Screen>
<Astrobj kind = "Python::Standard">
<Module>gyoto_sample_standard</Module>
<Class>FixedStar</Class>
Standard objects define a potential of some sort through method
__call__, below CriticalValue is inside the object, above is
outside. SafetyValue must be slighlty above CriticalValue, a
minimum of __call__ is searched when the potential is below
SafetyValue to check whether the object has been crossed.
<!--CriticalValue> 9. </CriticalValue-->
<!--SafetyValue> 11. </SafetyValue-->
In this Python implementation of the FixedStar (like in the
eponymous C++ implementation), CriticalValue and SafetyValue are
both set when setting the convenience, ad-hoc property Radius
defined in Python. The other Python-defined properties are the 3
space coordinates of the center of the FixedStar, a spectrum and
an opacity.
<Position> 0. 0. 0. </Position>
<Radius> 12. </Radius>
<Spectrum kind="PowerLaw">
<Exponent> 0 </Exponent>
<Constant> 0.001 </Constant>
</Spectrum>
<Opacity kind="PowerLaw">
<Exponent> 0 </Exponent>
<Constant> 0.01 </Constant>
</Opacity>
Gyoto::Astrobj::Python::Standard also support the rest of the
Gyoto::Astrobj::Standard Properties:
<OpticallyThin/>
<RMax>20.</RMax>
</Astrobj>
<Delta> 1e0 </Delta>
<MinimumTime> 0. </MinimumTime>
<Quantities>
Intensity
</Quantities>
One can also specify a unit (if Gyoto was compiled with --with-udunits):
Intensity[mJy/pix²]
Intensity[mJy/µas²]
Intensity[J.m-2.s-1.sr-1.Hz-1]
Intensity[erg.cm-2.s-1.sr-1.Hz-1]
Intensity[mJy.sr-1]
Intensity[Jy.sr-1]
<DeltaMaxOverR>0.01</DeltaMaxOverR>
<!--DeltaMax>0.1</DeltaMax-->
</Scenery>
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