Hola Juan, to add my 2 cents to what Bert is saying, if you would embed this feature into SGBNR it's much better, so it would be possible to give both corrections with the same tool. cheers Nicola http://astrofoto.laza.it _______________________________________________ Astro-Photo mailing list Astro-Photo@seds.org http://seds.org/mailman/listinfo/astro-photo