[daip] 3C138 in aipsletter

[Eric Greisen]

Crystal Brogan wrote:
> Hi Eric,
> 
> I noticed an entry under "uv-data matters" in the most recent AIPS note 
> regarding a 0.25" position error for the 3C138 model image. I wondered 
> if you could clarify a couple of things:
> 
> (1) has the model image always had this offset since its original creation?
> 
> (2) if you only used 3C138 for flux calibration (with this position 
> error) in place, what is the likely magnitude of affect on data?
> 
> Best,
> Crystal

Amy can answer better than I - if I get this wrong.

I think the error has been there a long time - perhaps forever in the X 
band model only.

But, if you used it for flux only, there should be essentially no error
in the calibration.

Eric