class_docstr: Main spectrum plot
docstr: Clear main spectrum curve
docstr_tok: ["Clear","main","spectrum","curve"]
code: def clear_plot(self):
      """Clear main spectrum curve"""
      self.curve.clear()
  
imports: import collections, math
  from Qt import QtCore
  import pyqtgraph
label_desc: Use image node_id 22 for calling the SpectrumPlotWidget obj's underlying member method code with example usage: obj.clear_plot() without return types