Fabric of Reality Book Club

The important thing is to be able to make predictions about images on the astronomers’ photographic plates, frequencies of spectral lines, and so on, and it simply doesn’t matter whether we ascribe these predictions to the physical effects of gravitational fields on the motion of planets and photons [as in pre-Einsteinian physics] or to a curvature of space and time.

I’m getting conflicting results online for this quote. Some sources that quote the same passage say singular ‘effect’, others use the plural like Deutsch does.

I don’t have access to the original text, so I can’t say for sure if this is possibly a slight misquote or if different people are just quoting different editions.