Difference in plot of manually calibrated image and image calibrated with function

[Sudeshna69]

Trying to study module 5.1- DMSP-OLS intercalibration from the https://worldbank.github.io/OpenNightLights/welcome.html The coefficient csv file is located in D drive. During calibration used the codes as per tutorial. However there is difference in the density plots of manually and functionally calibrated image. In fact, the difference when subtracting one array from the other is 11149. Attaching the image