[Gnuplot-info] Contouring in GnuPlot

[Martin O'S. <ap...@ds...>]

Hello 

I have a set of sample data as follows: 

CEMI (x) ggbs(y) FLOW MM (z) 

0.0        90.0     0 
6.5        58.7     166 
6.6        59.0     169 
7.3        65.0     141 
6.1        54.5     162 
8.5        76.2     217 
7.1        64.2     174 
6.0        54.2     209 
7.0        63.0     198 
7.6        68.3     171 

which produces a simple set of points on a 3D graph using splot. However, what 
I would like is to do is to interpolate between points to calculate the 
coordinates for a flow contour of, for example, 175 mm? 

Can anyone advise how I might do this? 

Thanks 

Martin O'Shea.