Absolute difference in BIC between spectral fits performed with and without an additional reddening/extinction term, using the Sonora Diamondback (top) and SM08 (bottom) atmospheric models, shown as a function of spectral type. Objects are shown in yellow where spectral fits including the extinction term are statistically preferred (i.e., BIC_{No Extinction} −  BIC_Extinction > 6), in green where fits excluding the extinction term are strongly preferred (i.e., BIC_{No Extinction} −  BIC_Extinction < −6), and in black where no statistically significant preference is found (∣BIC_{No Extinction} −  BIC_Extinction∣ < 6).