Simulation of the effect of varying background level on Plummer filament fitting. (a): The generated filament on top of the background. (b,c) The results of the fit for two different levels of background noise, with the original Plummer filament plotted with blue dashed lines, the background with green solid lines, and the sum of the Plummer and background with black lines. Frame b shows a stronger background w.r.t. the filament. (d,e,f) Violin plots of R (frame d). p (frame e), and FWHM (frame f) showing the results of the Plummer fit. Background noise decreases when moving right. The horizontal lines show the original Plummer parameters (dashed lines) and the median for our simulation (dotted line).