def rt_mean_pr_mean(ECG_points):
    """
    Calculate the mean RT Mean interval and PR_Mean

    Parameters
    ----------
    ECG_points : Dictionnary
        Contains the location of all point and the hearth beat data
    """
    RT_Mean = [T_peak-R_peak for T_peak,
               R_peak in zip(ECG_points["T_Peak"], ECG_points["R_Peak"])]
    PR_Mean = [R_peak-P_peak for R_peak,
               P_peak in zip(ECG_points["R_Peak"], ECG_points["P_Peak"])]

    return RT_Mean, PR_Mean