class_docstr: Click on a point to select and highlight it -- the data that
  generated the point will be shown in the lower Axes.  Use the 'n'
  and 'p' keys to browse through the next and previous points
class_docstr_tok: ["Click","on","a","point","to","select","and","highlight","it","--","the","data","that","generated","the","point","will","be","shown","in","the","lower","Axes",".","Use","the","'n'","and","'","p","'","keys","to","browse","through","the","next","and","previous","points"]
code: def __init__(self):
      self.lastind = 0
  
      self.text = ax.text(
          0.05, 0.95, "selected: none", transform=ax.transAxes, va="top"
      )
      (self.selected,) = ax.plot(
          [xs[0]],
          [ys[0]],
          "o",
          ms=12,
          alpha=0.4,
          color="yellow",
          visible=False,
      )
  
imports: import numpy
label_desc: Use image node_id 1 to create a new PointBrowser object  with example: obj = PointBrowser()