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One possible way is the following in a python script:

Loop for internal points along the line , e.g. 0.05, 0.10, 0.15 ... 0.95 pu of the line length.

Inside the loop:

1. Put a dummy bus at the point with LTAP.

2. Solve the load flow

3. Get and save the voltage at the dummy bus

4. Read the case to restore the network without dummy bus

After the loop, use matplotlib to plot all voltages along the line together with the voltages at IBUS and JBUS.

Knowing the line length in km, the distance can be converted from pu to km.