That is my own terminology, but is it not clear what is meant? I'll briefly repeat. Distant stationary observer determines, using receiver (for frequency f), and telescope (for test sphere diameter components Dr
) values for said test sphere in a gravity-free region. Next, at the same distance from observer, the same measurements are conducted with sphere located variously just outside or inside a spherical mass shell now present. The ratio of readings (after/before) = 'distortion factor(s)'. Perhaps I should have used a different term like 'contraction factor', but since both temporal and spatial components are asked for, seemed 'distortion' was reasonable omnibus term. The definitions in #1 now hopefully make total sense to you.