add_cartesian_y_marker# Emission.add_cartesian_y_marker(value, name=None, y_axis=1)# Add a cartesian Y marker. Note This method only works in graphical mode. Parameters: valuestr, floatValue to apply with units. namestr, optionalMarker name. The default is None. y_axisstr, optionalY axis. The default is "Y1". Returns: strMarker name if created.