FIMS: the instrumental mask simulator for FORS1 and FORS2

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Abstract
FIMS is a graphical user interface to prepare observations off-line for the two astronomical instruments FORS1 and FORS2 of the ESO VLT at Paranal. FIMS was originally designed to support the main mode of FORS only: multi object spectroscopy, but supports now all observing modes. FIMS shows the focal field of FORS upon a background sky image. A typical FIMS session consists of a few cursor clicks on the stars or galaxies of the sky image to set a slit. The saved configuration will be sent to Paranal observatory to execute the observations with FORS. The slit positions as specified by FIMS and performed by the alignment methods of the FORS observation software are accurate to (sigma) equals 0.075 CCD pixel (equals 0.015 arcsec, 8 micrometer).

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