In the old correlator system, 10 wide band channels, C01 to C10, were always available in parallel with the spectral correlator. With this system, if continuum emission is your primary interest, we recommend you create the UV table using a SET SELECTION CONTINUUM DSB C01 TO C10 command. This has the advantages of creating a small table, and automatically ignoring flagged subbands.
One possible problem is possible contamination by line emission. One workaround is to set a Mark on the corresponding correlator subband(s) when creating the table. However, this will mark both the USB and LSB receiver bands, thus loosing some sensitivity. An alternative is to create the UV table using SET SELECTION CONTINUUM USB C01 TO C10 command and then add the other sideband by changing the selection to CONTINUUM LSB. The sensitivity can now be maximized, and since USB and LSB are stored in different visibilities, there is no difference in the data processing. Continuum observations at different frequencies can also be merged in such a way (but beware of spectral index problems).
Using SET SELECTION LINE may also be used (and can help checking upon line contamination), but a drawback is that synthesized beams may differ from one channel to another because of data flagging. Beam cubes must be produced by UV_MAP and used by CLEAN