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VIMOS User Manual
VLT-MAN-ESO-14610-3509
If you wished a straight slit, just click ‘Straighten+Rotate’ after having clicked ‘View/Fit’. If you wish to
give the slit a given position angle, use the ‘Straighten+Rotate Angle’ bar (or type in directly the value in the
associated box) and click on ‘Rotate’. Remember that in normal pre-imaging, North is left (-x on detector)
and East is up (+y on detector), thus a positive angle here is measured from north (0) to west (+90, which by
the way would make very limited sense).
Once you are happy with you curved slit, click ‘Save’. This will update the ‘FLAG’ of the object to ‘A’
and store the fit parameters.
Unselecting objects
You can, at any time, reset a ‘FLAG’ to ‘S’ (select-able), i.e. erase the special flag you allocated to a object.
To do this: click on a special object then click on the button ‘UNSEL’. If you look now in the catalog, the
‘FLAG’ has been reset to ‘S’.