Table S2.

Calculated parameters for cw ESR spectral simulation of Δtau187 (322C) contained 20% R1 spin labels for spin dilution experiments using the three-component fit presented in Fig. 4 C and D

R1 spin-labeled content	Aggregation time	$p_1$, %	${\tau }_{R,1}$, ns	$p_2$, %	${\tau }_{R,2}$, ns	$p_3$, %	S
20%	0 min	10.1	1.1	87.5	3.6	2.4	0.64
	5 min	9.5	0.9	82.7	3.8	7.8	0.62
	15 min	7.4	1.0	75.4	3.4	17.2	0.65
	55 min	8.7	1.0	65.9	3.6	25.4	0.66
	75 min	9.4	0.9	57.8	3.5	32.8	0.62
	100 min	8.5	0.8	50.6	2.9	40.9	0.65
	150 min	8.7	0.8	34.5	2.8	56.8	0.63
	180 min	8.3	0.9	18.6	2.7	73.1	0.61
	14 h	7.9	0.9	15.8	2.6	76.5	0.60
100%	0 min	7.1	0.9	11.2	2.3	81.7	0.66

The order parameter S applies on $p_2$ and/or $p_3$.