docs: def limiter(arr):
      """
      Restrict the maximum and minimum values of arr
      """
      dyn_range = 32767.0 / 32767.0
      lim_thresh = 30000.0 / 32767.0
      lim_range = dyn_range - lim_thresh
  
      new_arr = arr.copy()
  
      inds = N.where(arr > lim_thresh)[0]
  
      new_arr[inds] = (new_arr[inds] - lim_thresh) / lim_range
      new_arr[inds] = (N.arctan(new_arr[inds]) * 2.0 / N.pi) *\
          lim_range + lim_thresh
  
      inds = N.where(arr < -lim_thresh)[0]
  
      new_arr[inds] = -(new_arr[inds] + lim_thresh) / lim_range
      new_arr[inds] = -(
          N.arctan(new_arr[inds]) * 2.0 / N.pi * lim_range + lim_thresh)
  
      return new_arr