code: def add_floating_axis2(ax1):
      ax1.axis["lon"] = axis = ax1.new_floating_axis(1, 6)
      axis.label.set_text(r"$r = 6$")
      axis.label.set_visible(True)
  
      return axis
  
file_path: matplotlib/galleries/examples/axisartist/simple_axis_pad.py
imports: import matplotlib.pyplot
  import numpy
  from matplotlib.projections import PolarAxes
  from matplotlib.transforms import Affine2D
  import mpl_toolkits.axisartist
  import mpl_toolkits.axisartist.angle_helper
  import mpl_toolkits.axisartist.grid_finder
  from mpl_toolkits.axisartist.grid_helper_curvelinear import GridHelperCurveLinear
label_desc: Use image node_id 3 for calling a global function with example usage: add_floating_axis2(ax1) and returns: axis