Many thanks to all who wanted to help me unzip a file from David Blake. I
can unzip files.  The problem was in his transmission, however.  We have a
damaged file amongst the 14 or so which were transmitted, and no chance
of fixing it, so I don't think there is any way to assemble all these
into one picture.  Thanks anyway, everybody.  David will have to try
retransmitting them.

Craig Brougher