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formation process. These stars do have convective cores that might produce  internal magnetic fields, and these might even survive into later stages of stellar  evolution, but information is limited by our inability to measure the  fields below the stellar surface. We Here we  use asteroseismology to study the occurrence of magnetic fields in the cores of low- and  intermediate-mass stars. We have measured the strength of dipolar  oscillation modes, which are suppressed by a strong magnetic field in the