code: def __change_range_z(self, slider):
      val1 = slider.left_disk_value
      val2 = slider.right_disk_value
      lr = self.__actor.low_ranges
      hr = self.__actor.high_ranges
      self.__actor.display_extent(
          lr[0], hr[0], lr[1], hr[1], val1, val2
      )
  
imports: import numpy
  from dipy.utils.optpkg import optional_package
  from dipy.viz.horizon.tab import HorizonTab, build_label, color_double_slider, color_single_slider
label_desc: Use image node_id 6 for calling the PeaksTab obj's underlying member method code with example usage: obj.__change_range_z(slider) without return types