Detection of [O III] 4363 Å amid blending with Hγ

Establish whether the [O III] 4363 Å line is present in the optical spectra of V1674 Herculis despite blending with Hγ, particularly during epochs when the Hγ/Hβ ratio is elevated.

Background

The nebular [O III] 4959 Å and 5007 Å lines are clearly detected from day 19.87 onward, but confirming the auroral [O III] 4363 Å is complicated by blending with the broad Hγ feature.

An increased Hγ/Hβ flux ratio suggests a secondary contribution that could be [O III] 4363 Å, but the authors cannot confirm it directly due to blending.