Correlation between ionized and warm molecular hydrogen mass for the LISs in NGC 7662, NGC 7009, and NGC 6543 (Akras et al. 2017, 2020). The gray shaded area represents the uncertainty of the regression line. Outflows from K 4-47 and LISs were excluded from the linear fit due to their significant deviation from the bulk. Red points correspond to these nebular components, with the more massive ones representing the outflows.