Main sequence diagram for our ALMA SMGs (a log-log plot of the SFR versus stellar mass). The data points are colour-coded with redshift as shown in the colourbar on the right. The red dashed line shows the mid-line position of the star-forming MS at the median redshift of the analysed SMGs (z = 2.30) as given by Speagle et al. (2014), with the lower and upper blue dashed lines indicating a factor of three offset below and above the MS. The red, dotted lines indicate the MS mid-line boundaries of the interquartile redshift range of IQR(z) = 3.15−1.91 = 1.24. For comparison, the green and magenta dashed lines show the MS mid-lines at the lowest and highest redshifts of the analysed sources (z = 0.87 and z = 6.40), respectively.