Column density ratio of CH₂DOH to CH₃OH (green) and CH₃OD to CH₃OH (blue) for NGC 6334I and other objects. For Orion KL the shaded bar indicates the range of ratios derived by Peng et al. (2012). For NGC 6334I shaded and filled bars indicate the ratios derived using the ¹³C and ¹⁸O isotopologues as base respectively. Error bars indicate the range of ratios derived with and without blending. For NGC 6334I MM1 only the region with the lowest (MM1 IV) and highest (MM1 I) ratios are plotted. References. ^(a)Jørgensen et al. (2017). ^(b)Bianchi et al. (2017). ^(c)Neill et al. (2013). ^(d)Peng et al. (2012). ^(e)Belloche et al. (2016).