Difference: MixedModeWeightAdjustment (10 vs. 11)

Revision 112014-04-02 - DirkPetry

Line: 1 to 1

META TOPICPARENT	name="EUARCCASASupport"

ALMA Mixed Spectral Mode Imaging with CASA 4.1 and 4.2

Before imaging the continuum of combined TDM and FDM spectal windows (SPWs), the WEIGHTS column of the MS have to be adjusted to compensate for the presently incorrect relative weighting between SPWs of different shape.

Changed:

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This adjustment should be made as the last step before imaging, i.e. also after any spectral averaging.

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More generally, this adjustment is necessary whenever a continuum image is to be made from SPWs that do not have the same channel width and number of channels. E.g., also in this pure FDM case

Spw  0 , channelwidth 244140.625 , nchan  3840
Spw  1 , channelwidth 244140.625 , nchan  3840
Spw  2 , channelwidth 244140.625 , nchan  3840
Spw  3 , channelwidth 488281.25 , nchan  3840

the adjustment is needed(!).

The adjustment should be made as the last step before imaging, i.e. also after any spectral averaging.

For this purpose, a new recipe was introduced in CASA 4.2 named "weights.py". It can also be used in CASA 4.1 and is available from the CASA repository at recipes/weights.py

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