| Feature in mine plan | Symbol | ||
| P | shaft | 1 | ![]() |
| Q | staple shaft | 2 | ![]() |
| R | Abandoned shaft | 3 | ![]() |
| S | Abandoned staple shaft | 4 | ![]() |

Pressure head characteristic of a mine fan and a mine characteristic curves are shown in the figure below:

Match the points with their corresponding nomenclatures