def METHOD_NAME(
    self,
    instrument_code: str,
    price_date_str: str,
    forward_date_str: str,
    resample_period: str = "D",
):
    """
    :param instrument_code: symbol for instrument.
    :param price_date_str: Contract ID for the priced contract - for example; "20220500"
    :param forward_date_str: Contract ID for the forward contract - for example; "20220500"
    :param resample_period: Contract prices are recorded at hourly intervals. For
    comparison the frequency is resampled. Parameter specifies frequency. Default "D" is day.
    If None raw time index for data is given.
    :return: a dataframe where volume data from the priced and forward contracts are merged together.
              two columns; "VOLUME_price", "VOLUME_forward". If resampled, aggregate volume is shown
    """
    comparison_df = self._create_comparison(
        instrument_code=instrument_code,
        price_date_str=price_date_str,
        forward_date_str=forward_date_str,
    )
    comparison_df = comparison_df.drop(
        columns=[
            "OPEN_price",
            "OPEN_forward",
            "HIGH_price",
            "HIGH_forward",
            "LOW_price",
            "LOW_forward",
            "FINAL_price",
            "FINAL_forward",
        ]
    )
    if resample_period is not None:
        return comparison_df.resample(resample_period).sum()
    else:
        return comparison_df