api 650 app P how to read figure p-2g or p-2h

[sjvd]

In the example p.2.9

They give bij the values R/T (1176) en a/R (0,008)

for Kr/(E(2a))= 3,1*10^-4 ???

I can't read this out the table.

I have translate de line(0,005)in a function y = 45055x-2,6472; when x=1176 y= 3,36*10^-4
and line (0,02) in function y = 114x-2,1453; when x=1176 y=2,95*10^-5

x=R/T=1176
y=Kr/(E(2a))

interpolate this two y values and for a/R (0,008)= Kr/(E(2a))= 2,84*10^-4 and not 3,1*10^-4 ???

who can help me??