The third plot which shows the vertical line has sigma_r' at the y-axis, but the plots above have a different vector there (sigma_0). sigma_0 values are much smaller. So actually the vertical line IS plotted in the first two plots as well, but its only a very tiny line. You can see it when you add a symbol
To see the same vertical line you plotted in the third plot, you would have to use the same expression at the y-axis:
Its a vector with seven elements, so for the plot only the first two elements are use. Thats the reason you just a get a line ranging from 22 to 36.6
Of course you could provide a different vector which covers the full y-range visible in the plot
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