Table 3.

NSR estimated using the NGS technique compared with the true NSR values.

Method	True slope	Measured slope	True std. dev.	Measured std. dev.	True NSR	Measured NSR
PET-edge	1.40	$1.36\pm 0.02$	4.80	$4.82\pm 0.28$	3.45	$3.54\pm 0.19$
50% threshold	0.92	$0.89\pm 0.02$	2.34	$2.33\pm 0.13$	2.56	$2.61\pm 0.17$
40% threshold	1.14	$1.11\pm 0.02$	1.00	$1.12\pm 0.06$	0.88	$1.00\pm 0.04$
30% threshold	1.38	$1.36\pm 0.01$	2.29	$2.15\pm 0.20$	1.65	$1.58\pm 0.15$