20.9 MOMENTS

[ADVANCED\]MOMENTS [Image|File.Ext] [/CUTS] [/MASK] [/METHOD Mean|Peak|Parabolic] [/RANGE Min Max TYPE] [/THRESHOLD Thre [Unit]]

Compute the 4 main "moments" of a data cube. If no argument is given, the data cube is either the SKY one (if present) or the CLEAN one. The argument may specify a Gildas file (when a . is present in the argument), or a SIC Image variable.

The 4 moments are stored in new SIC Image variables:

 M_AREA   Integrated area over the velocity range
 M_PEAK   Peak brightness value
 M_VELO   Mean or peak velocity
 M_WIDTH  Weighted line width

The options control the method, the selected part of the cube (default channels from FIRST to LAST), and the threshold for detection (default 3 sigma).

The resulting images can be displayed using command SHOW MOMENTS and saved using WRITE MOMENTS.