[daip] help with UVLSF, please

[Claire Chandler]

Oh right, it's a subtraction not a scaling.  It's not the same as BLCAL. 
Sorry for the confusion.

On Wed, 12 Dec 2007, Gustaaf van Moorsel wrote:

> Claire Chandler wrote:
>
>> We can't run UVLSF on the calibrator because we have no way of removing a 
>> scaled version of it from the target source.  Such a program could be 
>> written, and it is the equivalent of a frequency-dependent BLCAL.  But even 
>> then we would have to worry about the fact that there is no aliasing in the 
>> line emission, so such a correction would not be valid for the line data.
>
> But - assuming such a program can be written - the scaling would
> be based on the line-free channels only.  So the steps would be:
>
> 1 - do the UVLSF 4th order fit on calibrator scans
> 2 - scale this fitted shape so that it fits a number of line-free
>    channels at either end of the source line emission.
>
> Gustaaf
>