first you add them together and divide by two,
cuz midpoint is basically the middle of two points
i am not quite sure if you are trying to say 0.14 or 0.014, is it a typo?
so i did both, see which one helps
(0.13 + 0.14) ÷ 2= 0.135
(0.13 + 0.014) ÷ 2 = 0.072