Table 2. Photon pulse lengths calculated using the r.m.s. widths of the spectra.

Mean values of the obtained lengths (calculated mean), with standard deviations and accuracies compared with initial lengths.

Photon energy	Initial length (fs)	Calculated mean (fs)	Standard deviation (fs)	Accuracy (fs)
12.4 keV	1.5	6.2	2.8	4.7
	1.6	6.3	2.8	4.7
	5.6	5.9	2.3	0.3
	11.6	11.7	0.9	0.1
	15.5	15.6	0.6	0.1
1.24 keV	19.1	19.3	4.7	0.2
	22.2	21.7	4	0.5
	25.9	26.1	3.1	0.2
	30.5	30.3	2.3	0.2
	35.2	35.4	1.8	0.2
	39.3	39.2	1.5	0.1