O VII line flux, as inferred by the KYRLINE model, plotted against the monochromatic continuum flux at 0.5 keV. The six RGS observations show a positive trend, with the line flux (black circles) increasing with the continuum flux. The solid line shows the best fit correlation to the RGS data, which is significant at 99.7% confidence. A positive trend is also inferred from the EPIC-pn data, the red open circles (plus an upper limit in 2019a, red arrow) show these corresponding line fluxes.