code: def text_len(length, fs):
      """Approximation of text width"""
      return length * 0.6 * fs
  
imports: from __future__ import division
  import re
  from decimal import Decimal
  from math import ceil, cos, floor, log10, pi, sin
label_desc: Use image node_id 13 for calling a global function with example usage: text_len(length, fs) and returns: unknown