def _centre_data(self, scattered_data_list):
    data_cropped = []
    for (indx, scattering_event) in enumerate(scattered_data_list):
        centre = ((indx + 1) * 90)
        x_range_min = (centre - 90)
        x_range_max = (centre + 90)
        data = scattering_event[x_range_min:x_range_max]
        data_cropped.append(data)
    return data_cropped
def _centre_data(self, scattered_data_list):
    data_cropped = []
    for (indx, scattering_event) in enumerate(scattered_data_list):
        centre = ((indx + 1) * 90)
        x_range_min = (centre - 90)
        x_range_max = (centre + 90)
        data = scattering_event[x_range_min:x_range_max]
        data_cropped.append(data)
    return data_cropped