The following four 4 equations are needed to be plotted as CONTOUR lines on the axes space (C, T) where C is the horizontal axis, and T is the vertical axis.
Contour lines for each equation should be between 6 and 8.
in total there should be five (5) plots, one for each equation, and the fifth which, is the most important, a plot with all the four equations are imposed on the same axes system (C, T)
M = (C) * ( 2*T + 0.028) (eq. 1)
P1 = (0.1237) * (C^(-4/3)) * (T) * ((T+1)^(1/3)) (eq. 2)
P2 = (0.003) * (C) * (T+1) (eq. 3)
P3 = 4 * (C^2) * (T) * (T+1) (eq 4)
M contour lines to be dashed lines, while P1, P2 and P3 to be solid lines in different colours.
No area filling, and no labeling are required.