Sampling of the Orion A cloud. The color images represent the distribution of column density as derived by Lombardi et al. (2014) from Herschel Space Observatory data, and the numbers indicate the positions chosen using stratified random sampling. The right panel is an expanded view of the ISF, which contains some of the highest column density positions. The numbers refer to the column density bin of the position (1 is lowest and 12 is highest), the 10 pc scale bar assumes a distance of 432 pc (Zucker et al. 2019), and the wedge scale is in units of cm⁻².