The IMAGE command and the GreG part of the GRAPHIC program can be used to display images (contour maps) and UV data. To display images, use the following basic commands:
IMAGE Filename ! Connect to image file
LIMIT/RG ! Compute limits of plots
LEVELS List ! Set contour levels
RGMAP ! Draw contours
BOX/UNIT SEC ! Draw box, using arcseconds as angular units
See the GreG and GILDAS manuals for further details.
UV data also needs to be displayed. The UV tables are produced naturally in visibility order, which is not suited for display. Task TRANSPOSE or command TRANSPOSE in language VECTOR must be used first. We recommend these file extensions: .UVT for UV tables, and .TUV for their transposed counterparts. A .TUV table has the following format
Column 1 U coordinate in meters Column 2 V coordinate in meters Column 3 W coordinate in meters Column 4 Day (in CLASS units, a Modified Julian Date) Column 5 Time in seconds since 0:00 UT Column 6 Start antenna Column 7 End antenna Column 8 Real part of channel 1 visibility Column 9 Imaginary part of channel 1 visibility Column 10 Weight of channel 1 Column 11, 12, 13, etc. for other channels.TUV tables can be plotted using the following commands
COLUMN X Ix Y Iy/TABLE Table.TUV ! Ix and Iy are the interesting
LIMITS ! column numbers
POINTS
BOX
or directly using Tables as SIC variables
DEFINE IMAGE UV Table.TUV READ
LIMITS/VARIABLE UV[Ix] UV[Iy] ! Ix and Iy as above
POINTS UV[Ix] UV[Iy]
BOX
The GRAPHIC program can display data cubes in bit-map format.