Three modality address counts can be compared after each source closes. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Each modality declares an address count
The x-ray training map has 4 reciprocal bins, the MRI-style map has 4 phase rows, and the optical map has 4 fields.
Nbins=4,Nrows=4,Nfields=4
Equal counts make a comparable ledger
All three displayed counts are 4. That makes the training record auditable, not biologically proven.