transparent with figure units centimeters results in small image

[jlo88]

The following code results in a too small image:

fig = figure('Units','centimeters','position',[0,0,20,20]);
% fig.Units = 'pixels';
plot(randn(100))
export_fig('test','-png','-transparent')

Uncommenting the units back to pixels restores this:

[altmany]

Fixed