Fig. 2

Volumes at re-irradiation. Lower and upper box boundaries indicate first and third quartile, respectively. The line inside the box marks median. Whiskers above and below the box indicate smallest and largest value within 1,5 times of the interquartile range from the quartiles. Points above whiskers indicates outliers outside of 1,5 times the interquartile range from the third quartile. Abbreviations: PTV – planning target volume, V100 – the volume at re-irradiation with a cumulative dose of ≥100 Gy (EQD2)