Extracting data from singleplot TFR

[Piers Cornelissen]

Dear all,

I would like to get access to the values produced by singleplotTFR that go 
into the contour plots.

Normally, I understand that a sequence like this:

h = plot(y,x)
hgsave(h,'plot_fig.fig')
a = load('plot_fig.fig','-mat')

should allow one to access the datastructure in a plot.

However, when I tried hgsave with singleplotTFR I got the following error 
message:

??? Error using ==> hgsave
Invalid handle

Please can you advise how I get to the data.

Thanks

Piers C

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