Fig. 4

a Reconstructed 6-dimensional phase space. Contour lines indicate 90 and 50th percentile, while different line styles represent three cases in the error study. “Reference” indicates the nominal case. Note that only 90th percentile is shown for \((z-\delta )\) distribution. Blue histogram indicates the 1-dimensional histogram in each coordinate. b 3-dimensional scatter/density plot of the reconstructed beam phase space.