Table 3. Quality of reconstruction with combinations of sensed variables.

cormin	EVmax	svd3	ID	Secm	Sact	Sint	SZtit	Ls,act	Ls,int	eact	wstroke
		%		1	2	3	4	5	6	7	8
3 sensed variables
0.71	1.11	10	134	x		x	x
…
0.62	0.99	13	126	x	x				x
0.62	1.00	14	124	x	x		x
0.60	1.01	11	125	x	x			x
…
4 sensed variables
0.75	0.99	19	1236	x	x	x			x
0.74	0.97	13	1346	x		x	x		x
0.74	0.99	21	1234	x	x	x	x
0.72	0.99	17	1235	x	x	x		x
…
8 sensed variables
0.74	0.95	14	1–8	x	x	x	x	x	x	x	x

cor_min = minimum correlation coefficient.

EV_max = maximum Eigen value of feedback loop.

svd3 = distance to matrix singularity.

ID = evaluated combinations identified by sensor numbers.

S_ecm, S_act, S_int, S_Ztit, L_s,act, L_s,int, e_act, w_stroke are sensed variables (Table 2).