Table 1: Parameters of the single (m=0) double periodic (m=1) cosine functions and their superposition (m=0/1) fitted to the rotation measure variations in the two rings of NGC 4254 (cf. Fig. 3). Amplitude, phase shift, background offset, and the Theil U coefficient of the quality of fit are given.

Dynamo mode
Ampl. Ph. shift Offset Theil Ua
RING 3        
m=0 79 25 23 0.58
m=1 53 43 41 0.83
m=0/1 79/51 34 33 0.34
RING 4        
m=0 82 21 2 0.57
m=1 48 48 17 0.94
m=0/1 71/36 33 9 0.36
a The Theil U coefficient is limited to a range from zero
to one (Theil 1972). Zero means a perfect fit.

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