set deltah = 0.43010E-04
set n=1
data trans.dat
read kh 1
read trans 2

set del2 = deltah**2 * (kh*2997.9)**(3+n)*trans**2

set lkh = lg(kh)
set ldel2 = lg(del2)

limits -1.5 -0.5 -1 1
connect lkh ldel2
ticksize -1 10 -1 10
box
rel -3 0 
draw 3 0
rel  -0.86646 -3
draw -0.86646 3