Table 1. Oxygen vacancy concentration, δ, and cobalt oxidation state, y.

x in La1−xSrxCoO3−δ	δ	y
0	−0.01±0.01	3.01±0.01
0.2	0.01±0.01	3.18±0.02
0.4	0.05±0.04	3.30±0.08
0.6	0.09±0.01	3.43±0.01
0.8	0.16±0.01	3.48±0.02
1.0	0.30±0.03	3.40±0.06

Error is based on the s.d. of triplicate measurements.