docs: def D_baffle_holes(do=None, L_unsupported=None):
      r'''Determines the diameter of holes in baffles for tubes according to
      TEMA [1]_. Applies for all geometries.
  
      Parameters
      ----------
      do : float
          Tube outer diameter, [m]
      L_unsupported : float
          Distance between tube supports, [m]
  
      Returns
      -------
      dB : float
          Baffle hole diameter, [m]
  
      Notes
      -----
  
      Examples
      --------
      >>> D_baffle_holes(do=.0508, L_unsupported=0.75)
      0.0516
      >>> D_baffle_holes(do=0.01905, L_unsupported=0.3)
      0.01985
      >>> D_baffle_holes(do=0.01905, L_unsupported=1.5)
      0.019450000000000002
  
      References
      ----------
      .. [1] Standards of the Tubular Exchanger Manufacturers Association,
         Ninth edition, 2007, TEMA, New York.
      '''
      if do > 0.0318 or L_unsupported <= 0.914: # 1-1/4 inches and 36 inches
          extra = 0.0008
      else:
          extra = 0.0004
      d = do + extra
      return d