Percentage of ²⁴Mg vs. [Al/Fe] (top), ²⁵Mg vs. [Al/Fe] (middle) and ²⁶Mg vs. [Al/Fe] (bottom). Black triangles indicate the pristine populations and red triangles the polluted population. Also shown are the results from Meléndez & Cohen (2009) for M71. In the M71 sample, the polluted population is indicated with green, open diamonds. Blue open diamonds show the pristine population. Typical uncertainties of the isotope measurements for M71 is also shown.