text: from numpy import float64, int32
  from pandas import StringDtype
  
  __all__ = ["bim", "fam"]
  
  bim = {
      "chrom": StringDtype(),
      "snp": StringDtype(),
      "cm": float64,
      "pos": int32,
      "a0": StringDtype(),
      "a1": StringDtype(),
  }
  
  fam = {
      "fid": StringDtype(),
      "iid": StringDtype(),
      "father": StringDtype(),
      "mother": StringDtype(),
      "gender": StringDtype(),
      "trait": StringDtype(),
  }
  