| Region | Regression lines | R2 | Slope of line |
| Area close to the train track | y1 = –57.014x + 116426 | R2 = 0.6618 | –57.014 |
| Area far from the train track | y2 = 85.086x − 170857 | R2 = 0.4074 | 85.086 |
| Middle distance from the train | y3 = 34.071x − 68359 | R2 = 0.702 | 34.071 |