Thanks to you, and to David Winsemius who replied, I finally found a
solution, which works pretty fine :
filled.contour(x,y,z, plot.axes = {axis(1); axis(2) ; contour(x,y,z2, add =
T); contour(x,y,z2, nlevels = 1, level = 0, add = T, lwd = 1.5)})
Xavier
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