So, after mailing all the previous mails, I've thought maybe I'm not asking
the right question.
What I want to do plot is a cross section, and there is no easy way to
extrapulate between points. Not in excell and not in matlab.

here is a simplification:


                                                 distance
 _____________________________________________________
 |
 |                             x                                  x
 |                 x                       x                              x
 |
 |     y                y          y                y
y                   y
 |
 |              z
 |                           z                   z
z              z
 |
 |


suppose the letters represent the temps: 29, 26, 23 deg. cel.  and the
unmarked y axis is depth.
Now I want to draw contours between the x's y's and z's.  This will allow me
to create very quickly lots' of graph of temp. prfiles of the gulf.

Many thanks, again. Oz
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