docs: def is_in(bim, geno_range):
      r"""
      Parameters
      ----------
      bim : pandas.DataFrame
          Variant annotation
      geno_range : tuple
          (chrom, pos_start, pos_end)
  
      Returns
      -------
      Isnp : bool array
          Variant filter
      """
      Ichrom = bim.chrom == geno_range[0]
      Ipos1 = bim.pos >= geno_range[1]
      Ipos2 = bim.pos < geno_range[2]
      return Ichrom & Ipos1 & Ipos2