Appreciate the information Rudi. I was looking for the G2V stars for use
in photometric color calibration routine in Pixinsight but it turns out
the software already has a database of G2V stars for comparison.

Thanks again,

Tom

On 11/6/2017 11:23 AM, chasseurdesgalaxies@... [guide-user] wrote:
>
>
> Hi Tom,
>
> I am not an informatician, but I was wondering, if you could not just do
> the following:
> - make a copy of the downloaded .tdf file,
> - open the .tdf file with notepad,
> - look - at the beginning of the file - at the lines of the 20 stars and
> how the data are arranged per line,
> - take another G2V catalogue (--> google),
> - re-arrange and shorten the data from this other catalogue in the same
> way, as they are in the (notepad =
> tdf) file,
> - copy the re-arranged data below the existing lines in the notepad /
> tdf file
> -save the amaneded file as COLORCAL.tdf.
>
> As I said, I am not an informatician (and I do not know for instance,
> whether you need also to change something in the lower part of the .tdf
> file (below the star list), perhaps because the number of the lines /
> stars has changed)?
>
> But you could always give it a try (as you still have the backup copy).
>
> Rudi
>
>