Determining the noise and signal levels to classify on- and off-cloud stars for the Taurus (panel a) and Gemini (panel b) molecular clouds. The blue and green dashed lines represent the Gaussian and exponential distribution, respectively, and the dashed vertical red lines mark the switch point between the two distributions. We use the Gaussian mean (the solid vertical blue lines) for the noise cutoff level and the exponential median (the solid vertical green lines) for the signal cutoff level.
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