Exporting data for multiple Cut planes

Hi all,

I'm modeling a mixer and I would like to export concentration profiles at different cut-planes along the channel. I can do a single cut plane export with:
Defining: Data Sets -> Cut Plane - then...
... Export -> Data -> Data set -> Output...

How can I do the same for multiple cut planes - when I try to use the same procedure (under Data Sets -> Cut Plane ...) defining multiple Cut planes via 'Additional parallel planes' options it doesn't work. For the concentrations I get only NaN-s.

Thank you in advance for your generous help!
Izidor