def compute_plot(self, contour_values):
    '\n        Get current selection and trigger update\n        '
    (entity, data) = self.get_selected_entities()
    if (data is None):
        return
    if (contour_values is not None):
        self.contours.value = contour_values
Get current selection and trigger update
def compute_plot(self, contour_values):
    '\n        \n        '
    (entity, data) = self.get_selected_entities()
    if (data is None):
        return
    if (contour_values is not None):
        self.contours.value = contour_values