What would be the mathematic equation that expresses the relationship of the following graph, light intensity versus distance?

220 210 200 190 180 170- 160 150 140 130 Intensity (lux) 120 110 100 90 Inverse Power A/(X-Xo)" + B 80- A = 7.36 + 0.15 X = 0.00 + 0.0 70- n = 2.43 + 0.014 60- B = 5.06+ 0.42 RMSE = 0.272 50 40 30 20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 r (m) Figure 1. Intensity as a function of distance