Question: Subscripts and superscripts in a plot

I am facing three issues while plotting my plot.I need help modifying the syntax:

  1. I am unable to correctly display superscripts and subscripts for Pi[m]^WD < Pi[m]^D inside the graph region

  2. I cannot format the subscript for i__2 on the x-axis.

  3. A horizontal dotted line appears parallel to the x-axis at y=0.5; how can I remove this line?

    Question_1_regional.mw

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