1. Load Pic3D
2. Draw a line with measurement plugin
3. Select both with activated image statistics plugin

Now as expected, a line profile is plotted in the Histogram view.
The statistics show NA for each value.
I would find it intuitive if some of the statistics would be filled, as e.g. Mean or StdDev, RMS, Max, Min and N. Of course applied on the line profile. Some values could stay NA, as e.g. V(mm^3) as they make no sense on a planar 2D figure.