# create Smith chart grid
complex (x, y) = x * {1,0} + y * {0,1}
conformal (z) = (z-1) / (z + 1)
pi = 4 * atan (1) 
set xrange [-1.1: 1.1]
set yrange [-1.1: 1.1] 
# generate Smith chart grid data file 
set table 'smithgrid.dat'
set samples 1500
a = -1
set parametric
set multiplot
load 'smithloop.p'
unset multiplot
unset parametric
unset table