Convert from the Chip to Focal Plane coordinate (FPC) system.
Array_Type pix_chip_to_fpc( Integer_Type chip_id, Double_Type x,
Double_Type y )
This routine converts a position in the Chip coordinate system
to the matching position in the Focal Plane coordinate (FPC) system,
using the current settings of the pixlib module.
The FPC system corresponds to the ( DETX, DETY ) columns of
a Chandra event file.
The inputs are chip ID (the ccd_id value for ACIS and chip_id
value for HRC data) and the chip location (x,y) in pixels.
The return value is a two-element array which gives the
FPC coordinates in pixels.
chips> require( "pixlib" )
chips> pix_init_pixlib
chips> fpc = pix_chip_to_fpc( 3, 512, 512 )
chips> print( fpc )
4576.94
4730.43
Using the default settings of the pixlib module (i.e.
the detector is ACIS with the aimpoint on ACIS-I1), we
find that the chip position (512,512) on ACIS-3 (i.e. ACIS-I3)
corresponds to the location (4576.94, 4730.43)
in the focal-plane system.
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