In [4]:

channel8.subchannels[0].transform

Out[4]:

<Bivariate (ID 1): ((0.00286201473802*x*(y-22.0617816092))+(-1.30091579001*x)+(0.0*(y-22.0617816092))-9.01973209099)>

In [5]:

channel8.subchannels[0].transform.coefficients

Out[5]:

(0.00286201473802, -1.30091579001, 0.0, -9.01973209099)