Left panel: fractions of “true” detections (solid color lines) in tests of filament extraction as a function of the robustness threshold RT used with DisPerSE (in units of on the bottom x-axis and 10²¹cm⁻² on the top x-axis), for three values of the input (AR = 3, 5, 10 – see symbols at the bottom left of the plot) and four values of the input column density contrast (C⁰ = 0.3, 0.5, 0.7, 1, 2 – color coded as shown at the top right of the plot). The statistics shown in this plot are based on a total of 1000 synthetic filaments with Gaussian profiles of FWHM = 0.1 pc for each set of (AR, C⁰) input values, added to the background map shown in Fig. A.1a. The persistence threshold used in DisPerSE was fixed to PT = rms_min. Right panel:as in left panel but for the fractions of “spurious” detections (dotted color lines).