Surface brightness analysis of filament and background. Top: box placement in the wavelet-filtered image. Bottom: results of the SB analysis from the top boxes. The dashed lines between the data points are only for the purpose of better visualization and have no physical meaning. The dark gray band shows the weighted arithmetic mean with the 1 σ interval of all magenta boxes, and the light gray band shows the weighted arithmetic mean with the 1 σ interval of all background boxes.