def METHOD_NAME(filename="channel_cal_val.pkl"):
    """ Load Pluto Rx1 and Rx2 calibrated value, if not calibrated set all channel gain correction to 0.
        parameters:
            filename: type=string
                      Provide path of phase calibration file
    """
    try:
        with open(filename, "rb") as file:
            return pickle.load(file)  # Load channel cal values
    except:
        print("file not found, loading default (no channel gain shift)")
        return [0.0] * 2  # .append(0)  # if it fails load default value i.e. 0