getting rid of thick zero contour

[Keith Lindsay <klindsay@xxxxxxxxxxxx>]

Greetings,

I am having difficulty making the zero contour be the same thickness as
other in some contours that I am making. The following command produces a
contour plot with a heavy zero contour. (At least it does on my computer.)

contour/i=1:100/j=1:100 (i/100)^2+(j/100)^2-1

I've tried using various combinations of lev and pen qualifies and some
ppl pen commands, but cannot seem to make the zero contour as thin as the
others.

If anyone can tell me how to do this, I would greatly appreciate it.

Thanks,
Keith

***********************************************************************
Keith Lindsay                              phone: 303-497-1722
Climate and Global Dynamics                fax:   303-497-1700
National Center for Atmospheric Research   email: klindsay@cgd.ucar.edu
P.O. Box 3000
Boulder, CO  80307-3000