Original sentence: The Wolf Effect (sometimes Wolf shift) is a phenomenon in radiation physics that manifests itself as a frequency shift in the electromagnetic spectrum.Under certain conditions, the shift may be distortion free, Wolf and James write:
Edited sentence: The Wolf Effect (sometimes Wolf shift) is a phenomenon in radiation physics that manifests itself as a redshift or blueshift in the electromagnetic spectrum.Under certain conditions, the Wolf Effect may also produce a distortion-free Doppler-like redshift, Wolf and James write: