 | The number of \textit{C} faults that occur in each environment per 1000 hours of LINAC uptime. The LMIC data is calculated by taking the mean number of faults per 1000 hours uptime of the 6 Nigeria LINACs and 2 Botswana LINACs and the HIC is the mean of the 6 UK LINACs. The error bars represent the standard deviation to give an indication of the spread. |
 | (Upper) The number of air, cooling and generator subsystem category \textit{C} faults that occur in each centre per 1000 hours of uptime. (Lower) Comparison between category \textit{C} chiller failures at different centres. |
 | The number of vacuum subsystem category \textit{C} faults that occur in each centre per 1000 hours of uptime. |
 | Downtime for Enugu (2011) LINAC. |