How to create the short red line series in this diagram?

please i am at entry level to grasshopper. i would appreciate some help. Please how do i create those short lines in red between lines so that lines one the next line are exactly half way between the two lines on the previous line. What commands can i use to achieve these. i have all the points in yellow and the lines in black sorted out so far.


Can you upload your files?? Maybe helps to understand your isse.

V1 (27.0 KB)

sure thanks @samuelef1992