Correlations between the properties of Hε emission profiles and atmospheric quantities. The atmospheric properties have been weighted by the relative contribution functions. Panel a: Source function and line core intensity (derived from a Gaussian fit) in brightness temperature. Panel b: Source function versus gas temperature. Panel c: Source function and transition probability p₁₇. The color of the points indicates if Hε is optically thin or thick, as shown by the color bar that shows log₁₀(τ_afd). The probability density functions of the points, calculated using Gaussian kernel density estimation, are shown at the top and right of each panel.