Reddening coefficient c(Hβ) (left panel) and electron density (right panel) maps extracted from the 2021 epoch. In the left panel, the fainter contours of [NII] λ 6583 emission are delineated (from 2 × 10⁻¹⁹ to 2 × 10⁻¹⁸ erg s⁻¹ cm⁻² in increments of 2 × 10⁻¹⁹ erg s⁻¹ cm⁻² per spaxel) in comparison with the depiction in Fig. 1. This adjustment was made to accentuate the observed correlation between large c(Hβ) values and the absence of [NII] emission in the northwest of Mk 34.