> In the meantime,
>
> http://www.projectpluto.com/mar_fmt.htm#isophotes
>
> gives some information about how to adjust contrast. In brief, edit
> STARTUP.MAR and look for this line:
>
> 48 outlined 1 1 31 164 0
> A B C D E
>
> Numbers 'C' and 'D' could be changed to, say, 10 and 80 to get much
> fainter isophotes.

Hi Bill,

number C set to 5 and number D set to 30 gives the look I'll prefer. It
gives a realistic "dim glow" on my screen.
I will now let the Isophotes turned "on".

Together with the new "Blurring and saturation"-option for stars, it really
improves the realistic screen display of GUIDE.

Masaki's suggestion of "star-like" planets would improve it even more.

Thanks again for you help.

Oliver