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             VELOCITY FRAMES and SOURCE CATALOGS

	Files named 'anything'.cat may be used to list sources and coordinates.
 Your area contains the example dummy.cat.  Use any text editor to prepare
similar catalogs for your observing run.  If you wish, simply modify dummy.cat
and rename it using the UNIX command 

              mv dummy.cat `anything'.cat 

where 'anything' is the catalog name convenient for you.

	Permitted coordinate frames include B1950.0--the usual reference frame
(B stands for Besselian)--and GALACTIC.  We cannot accommodate epoch J2000.0 at
this time. 

	Velocities are in units of km/s.

     The telescope control system supports four spectral line velocity frames:
Local Standard of Rest (LSR), Heliocentric (HEL), Geocentric (GEO), and
Topocentric (TOP).  The velocity frame abbreviation is shown on the on-line
status monitor.  The default frame when the entire system is reloaded is LSR. 
Also shown on the status monitor is the Velocity Type, or definition, which can
be Radio (RAD), Optical (OPT), or Relativisitic (REL).  The system default is
RAD. For extragalactic sources, observers may want to consult Section 6.1 of
the paper "Observations of radio lines from unresolved sources:telescope
coupling, Doppler effects, and cosmological corrections" by Gordon, Baars, and
Cocke 1992 A&A October for information on the meaning of the Doppler
velocities. (The Millimeter-Wave Calibration notebook contains a copy of the
paper.) 

     Observers should indicate the velocity frame explicitly on their source
catalog entries.  Although blank field is interpreted as LSR, we recommend that
you explicitly type LSR to leave no doubt as to what was intended.  The system
will not accept the old FORTH designation of KM/S; if the entry contains KM/S,
an error message will be printed on the operator's console and the existing
velocity will not be changed. 

     Observers may also indicate the velocity type (RAD, OPT, or REL) on their
source catalog entries.  A blank field will be interpreted as RAD. 


     The general format for RA/DEC coordinates is

HH:MM:SS.SS  sDD:MM:SS.S  Coord-frame  Name  sVV.V  Vel-frame  Vel-Type

Example:

09:45:14.80  13:30:41.0  B1950  IRC+10216  -26.0  LSR  RAD

					P. R. Jewell and M. A. Gordon
					24 October 1992