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/SYSTEM systemName

Name of system for offsets.

Character :: systemName          ! name of system, one of:
                                 ! PROJECTION
                                 ! TRUEHORIZON
                                 ! NASMYTH

<<TBD:                           ! DESCRIPTIVE>>
<<TBD:                           ! BASIS>>
<<TBD:                           ! EQUATORIAL>>
<<TBD:                           ! HADECL>>
<<TBD:                           ! HORIZONTAL>>

PROJECTION for now means only the standard simple "radio" projection
offsets in the chosen coordinate system. This is normally the
astronomical system of offsets in which point-by-point (TRACK, ONOFF)
or on-the-fly (OTFMAP) maps are made.

TRUEHORIZON means the horizontal system with a factor 1/cos(elevation)
applied to the azimuth offset.  

NASMYTH are special offsets to point an off-center pixel of a
focal-plane array receiver (bolometer, HERA) to the commanded
astronomical position, e.g., to use an off-center pixel for pointing,
focus, ONOFF.

IMPORTANT NOTE: projection, trueHorizon
 
   If the observing mode (LISSAJOUS, ONOFF, OTFMAP, ...) 
   is in /SYSTEM projection, 
   OFFSETS ... /SYSTEM projection is ignored (not used).
   If the observing mode (LISSAJOUS, ONOFF, OTFMAP, ...) 
   is in /SYSTEM trueHorizon, 
   OFFSETS ... /SYSTEM trueHorizon is ignored (not used).

IMPORTANT NOTE: OFFSETS   /SYSTEM Nasmyth


   If OFFSETS xOffset yOffset /SYSTEM Nasmyth are specified in pako,
   the values xOffset yOffset are used during the observations. 
   (this inludes the case that they are explicitly set to 0.0). 
   It is up to the observer to make sure that they are "correct".
   (in pakoDisplay /SYS Nasmyth will be highlighted as yellow alert.)

   If OFFSETS xOffset yOffset /SYSTEM Nasmyth are not specified
   (cleared), for the MAMBO bolometer, Nasmyth offsets are used
   automatically according to the selected bolometer channel (pixel).
 
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