Spectrum of the H II region at a distance of $\mathrm{\Delta }d\sim 1\stackrel{″}{.}0$ from the nucleus taken on 2015 September 24 and 2017 October 23, respectively, intercalibrated to the same [O III] λ5007 flux of (4.2 ± 0.3)×10⁻¹⁵ ergs s⁻¹ cm⁻² (upper panel) and the resulting difference spectrum (lower panel). Spectral regions strongly influenced by telluric absorption are shown in gray. The apparent continuum flux increase on 2017 October 23 is caused by scattered radiation from the brightening nucleus.