Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
thanks to Ali Bahrami and Phil Sterne for responding to my problem. Apparently the extra dots are causedby a bug in the Ultrix X-windows support and is fixed in Ultrix 4.2. Also the dots only show up when part of a window is obscured, a point I had missed before. Jayant Murthy, Dept. of Physics