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.