Variation of coronal hole physical parameters across latitudes. Figure illustrates the variation of different physical parameters (shown as blue triangles) such as the area, radiative flux emitted by the coronal hole on the Sun and at the Lagrangian point L₁, and the apparent temperature structure of the coronal hole across latitudes. The continuous red line represents a least-squares fit and dashed red lines denote one standard deviation error bands, computed from all data points. While χ² serves as a measure of the goodness of fit.