Website of Tobias Westmeier

Additional hints for AIPS

Start AIPS remotely

Switching the velocity reference system

To define the relationship between frequency axis and radial velocity in one's favourite reference system one can use the verb

The required parameters of ALTDEF are displayed by the command INP ALTDEF. Typical inputs for an H i data set could be

After having defined the frequency-velocity relationship with ALTDEF one can use the verb

to change the spectral axis type from frequency to velocity (and back again) before computing moment maps of a data cube (but after imaging and deconvolution).

Computing moment maps

Before moment maps of a data cube can be created, the cube has to be transposed to change the order of spatial and velocity axes. This is done by the task

where the correct axis order (312) can be specified. After changing the axis order, moment maps can be computed using the task

(Caution: For unknown reasons the authors of AIPS decided to omit the »E« in the name of the task!)

Other useful commands

Clear the read/write status flags of files:

Delete tables:

Shut down all servers and message windows and exit from AIPS: