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Contour lines


I would like to read and plot a file containing contour lines' data.
This file is structured like this:

"510" -10
265.3136 126.4515
265.2717 126.4695
265.2859 126.518
"500" -44
262.2817 126.1265
262.1928 126.1052
262.1099 125.9828
"510" -32
265.2817 126.6879
265.2717 126.6653

("contour line's altitude") (contour line's identifier)
 (x1) (y1)
 (x2) (y2) ... point's coordinates of the contour lines

But I don't find the way to do this.

Is it possible to do this with Mathematica? Must I change the structure
of the file? How?

Thanks for your help...




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