Spectrum extracted at the position of foreground galaxy, G2, without continuum subtraction. Upper panel: Zoom-in view of the spectrum around Hα. Middle panel: Zoom-in view of the spectrum around [S III]9533. Bottom panel: Zoom-in view of the spectrum around He I10833. Same line-marking conventions are adopted as Fig. B.1. We further mark in orange the position of [Ne III]3869 emission from 4C+19.71 which is near the [S II]6716,6731 doublet of G2 (upper panel).