[R] GAM 2D-plotting

[Nixon Bahamon]

Hi,

When I fit a GAM model (using mgvc) with overlapping terms, such as

gam(y~s(x,z)+s(z,w))

and afterwards I pretend to plot the component smooth functions that make it up
using plot.gam, I achieve a couple of 2D plots.

My question is: What's the meaning of those 2D plots in terms of y?

Regards,

Nixon