Integrated opacities of three optically thin methanol (CH₃OH) transitions adopting a continuum source covering factor f_c = 0.38. The data were obtained at Effelsberg (for details, see Bagdonaite et al. 2013a,b) and are shown to demonstrate the decline in opacities during 2012/3 in a qualitative way. The 1₀ ← 0₀ E and the 2₀ ← 3_-1 E opacities were multiplied by (arbitrary) factors of 3 and 8, to bring values of all lines to roughly the same y-axis scale. Calibration uncertainties are of order 10% or smaller.