Distribution of the different S states (% of the total PSII amount) in EPR samples after the application of 0–6 turnover flashes given at frequency of 5 Hz and 10 Hz at 1 °C (see ESI Fig. 1)^a.

Fl. freq.	Fl. no.	S1	S2	S3	S0	S1(2nd)	S2(2nd)	S3(2nd)	Total
5 Hz	0	100							100
	1		100						100
	2		35 ± 1	65 ± 1					100
	3		16 ± 2	29 ± 2	57 ± 1				102
	4		11 ± 2	13 ± 1	26 ± 1	49 ± 1			99
	5			6 ± 2	15 ± 1	28 ± 1	53 ± 3		102
	6				6 ± 1	10 ± 1	44 ± 2	40 ± 1	100
10 Hz	0	100							100
	1		100						100
	2		43 ± 2	57 ± 1					100
	3		24 ± 2	28 ± 1	48 ± 1				100
	4		17 ± 1	13 ± 2	33 ± 3	37 ± 3			100
	5			6 ± 1	22 ± 1	23 ± 3	46 ± 1		97
	6				14 ± 1	14 ± 1	41 ± 1	29 ± 3	98

^aThe fraction of the S_i – state was determined from the EPR spectra as described in the text and in ref. 40.