Integrated spectrum from a 1″ circular region centered on HL Tau and extracted from the noncontinuum subtracted data cube. The orange and purple line differentiate the spectra extracted in two different execution blocks of the same spectral window. The bold lines were computed performing a moving average over ten consecutive channels to highlight the variations on a scale of ~ 0.003 Jy. The black dotted lines indicate the region of the spectrum where the two covered and nonde-tected methanol 3_(−1,2)−2_(−0,2) E and 6_(1,5)−6_(0,6) A line fall.