Light curves for M4 millimagnitude RR Lyrae (mmRR)

Included are files with light curve (measured brightness over time) data, about 80 days' worth, for three stars in the globular cluster M4 that exhibit millimagnitude level, RR Lyrae-like variability. The data are derived from images taken by NASA's Kepler/K2 mission. The enclosed README provides details on the data contained in the files. The variability shown by these stars has not been seen in similar kinds of stars before, and represents a new class of stellar variability as far as we have been able to determine.