Error analysis of melanisation measurements from 31 individuals of <i>P</i>. <i>icarus</i>, each imaged twice and each image digitised twice.

Imaging error is the error of photographing the wings and residual error is the error due to digitising. Model applied: melanisation = ind + imaging(ind). Error analysis of melanisation measurements from 31 individuals of P. icarus, each imaged twice and each image digitised twice.