Fig. 4.

Registration error for different algorithms. Algorithm definitions according to Table 2 - Overview of the different investigated registration algorithms. Each box shows the distribution of the Mean Distance Error (MDE - average distance between dwell positions in mm). The lower and upper ends of the box correspond to the 25th and 75th quartiles respectively. Whiskers extend up to 1.5*IQR (inter-quartile range). Horizontal lines in the middle of each box represent the median value. Mean error and standard deviation are provided above.