Mass flow rate graph

Lior

Hi everybody, I have been trying to get a mass flow rate graph (my model simulates flow through a partially occluded vessel). I used the surface monitor to get the graph, however, instead of the momentarily mass flow rate (the mass flow computed for each time step), i got a cumulative mass flow rate graph. I looked everywhere and didn't understand how to change it. Another problem was that when trying to write the file, in order to read it later in excel, i got the x-y data in the same column in excel, where it could not be separated... Does anyone know why was it and how to change it? Answers for bpth questions will be very appreciable! Thanks.