Running flow sim of an exhaust system.  Using porous medium as catalyst and evaluating velocity profiles right in front of porous medium (in Z direction only).  I'm looking at a section plot 1 mm in front of the porous medium:

Plot scaling is set to min and max value of the plot itself  4.9 to 9.2

The face of medium is at z = -.0768.  So plot would be at -.0778

So I'm then exporting z velocity values in all cells in z range of -.077 to -.078.

When I histogram those values in XL, I don't see the same range of numbers as on the plot.  Velocity range is only 6 - 8.5.

I assume it has to do with what cells I'm clipping in that range vs how plot files grab data in a single section plane.  But I don't know where to find details on that to understand it. 

Thanks,

Reese