@staticmethod
def merge(reports):
    """Method used to merge multiple reports together. Here it simply
        concatenates the lists of values saved in the different reports.

        Parameters
        ----------
        reports : list of dict
            List of reports that need to be concatenated together

        Returns
        -------
        report : dict
            Final report with all concatenated values
        """
    report = reports[0]
    keys_report = list(reports[0].keys())
    for other_report in reports[1:]:
        for key in keys_report:
            report[key] += other_report[key]
    return report
