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/SYSTEM systemName

Name of system for offsets.

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

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.  This is the system in
which OTF maps with Wobbler switching and the bolometer are normally
done.

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