Goldstein phase filtering increase raster size of i and q band but coherence band remains same

Microwave Toolbox Interferometry
1

After multilook, the raster dimension of i, q and coh is same

234 × 390

but phase and intensity band have dimension as 235 × 390

Next after applying Goldstein phase filtering, the new raster size of i, q, phase and intensity band is same as 235 × 390

but coherence band remains same 234 × 390

why such discrepancy ?

2

@lveci could you please take a look? Thank you!