Hi Im trying to map a nonlinear function but do not have the slightest idea of how to do it. I plugged the data below in excel and plotted the graph and came up with not the best function but something like in the ball park

y = -31.84ln(x) + 267.47

The left column is temp and the right column is resistance. If you take a look you will notice the resistance is not linear.

-40 100865 -35 72437 -30 52594 -25 38583 -20 28582 -15 21371 -10 16120 -5 12261 0 9399 5 7263 10 5658 15 4441 20 3511 25 2795 30 2240 35 1806 40 1465 45 1195 50 980 55 809 60 671 65 559 70 469 75 395 80 334 85 283 90 241.8 95 207.1 100 178 105 153.6 110 133.1 115 115.7 120 110.9 125 88.3 130 77.5 135 68.3 140 60.3 145 53.4 150 47.5