Catalog dust-parameter uncertainties for different CO velocity-component multiplicity bins. Panel (a) gives the numbers of PGCCs with one, two, and more than two detected ¹²CO or ¹³CO components. Panels (b) and (c) show the median relative uncertainty ﹩{\sigma }_{{N}_{{{\rm{H}}}_{2}-{\rm{dust}}}}/{N}_{{{\rm{H}}}_{2}-{\rm{dust}}}﹩ and the median dust-temperature uncertainty ﹩{\sigma }_{{T}_{{\rm{dust}}}}﹩ in the same multiplicity bins. Black circles and gray squares represent the ¹²CO- and ¹³CO-selected samples. Error bars denote median absolute deviations.