# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'surface1.24.png'
set dummy u,v
set parametric
set view 70, 20, 1, 1
set samples 51, 51
set isosamples 20, 20
set mapping spherical
set style data lines
set title "Test of spherical coordinates" 0.000000,0.000000  font ""
set xlabel "X axis" -3.000000,-2.000000  font ""
set xrange [ * : * ] noreverse nowriteback  # (currently [0.00000:15.0000] )
set ylabel "Y axis" 3.000000,-2.000000  font ""
set yrange [ * : * ] noreverse nowriteback  # (currently [0.00000:15.0000] )
set zlabel "Z axis" -5.000000,0.000000  font ""
set zrange [ -1.20000 : 1.20000 ] noreverse nowriteback
sinc(u,v) = sin(sqrt(u**2+v**2)) / sqrt(u**2+v**2)
xx = 6.08888888888889
dx = 1.11
x0 = -5
x1 = -3.89111111111111
x2 = -2.78222222222222
x3 = -1.67333333333333
x4 = -0.564444444444444
x5 = 0.544444444444445
x6 = 1.65333333333333
x7 = 2.76222222222222
x8 = 3.87111111111111
x9 = 4.98
xmin = -4.99
xmax = 5
n = 10
zbase = -1
splot "glass.dat"