The M 4 Core Project with HST-II. Multiple stellar populations at the bottom of the main sequence

A. P. Milone^*, A. F. Marino, L. R. Bedin, G. Piotto, S. Cassisi, A. Dieball, J. Anderson, H. Jerjen, M. Asplund, A. Bellini, K. Brogaard, A. Dotter, M. Giersz, D. C. Heggie, C. Knigge, R. M. Rich, M. van den Berg, R. Buonanno

^*Corresponding author for this work

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