code: def _parse_run_control(block):
      
      _, max_iterations, strain_ratio, _, _ = parse_fixed_width(
          2 * [(5, int)] + [(10, float)] + 2 * [(5, int)], block)
  
      return propagation.EquivalentLinearCalculation(
          strain_ratio, max_iterations, tolerance=10.)
docs: Parse run control block.