Table 10.

Magnitude of the correlation coefficient of the clustering assignment with either R or log R when using all of the coefficients, only the coefficients corresponding to the magnetogram component (SVD elements 2–4 in Fig. 4), or only magnetogram gradient coefficients (SVD elements 3 and 4 in Fig. 4). For NMF, all of the dictionary elements are associated with the magnetogram and many of them have gradient components so we only perform clustering with all of the coefficients.

All Mag. only Grad. only All
R 0.09 0.30 0.34 0.15
log R 0.02 0.37 0.45 0.08

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