code: def tlog_inv(y, th=1, r=_display_max, d=_l_mmax):
      
      if th <= 0:
          raise ValueError('Threshold value must be positive. %s given.' % th)
      x = 10 ** (y * 1. * d / r)
      try:
          x[x < th] = th
      except TypeError:
          if x < th: x = th
      return x
docs: Inverse truncated log10 transform.
      Values
  
      Parameters
      ----------
      y : num | num iterable
          values to be transformed.
      th : num
          Inverse values below th are transormed to th.
          Must be > positive.
      r : num (default = 10**4)
          maximal transformed value.
      d : num (default = log10(2**18))
          log10 of maximal possible measured value.
          tlog_inv(r) = 10**d
  
      Returns
      -------
      Array of transformed values.