carrier concentretion

i am trying to plot the distance-carrier_concentration graph above with these formulas:

enter image description here -and- enter image description here

(p-side: x < -xp , n-side: x > xn)

But i could draw only red lines on the graphs with these formulas. How can i or with what formula draw black lines on the graph that majority carrier and space charge region concentration?

I am new and i need your help :) Thanks in advance.


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