def get_sctrajs(ftrajs, scaler):
    """
    Scale a dictionary of featurized trajectories
    :param traj_dict: The dictionary of featurized trajectories, represented as np.arrays of shape (n_frames, n_features)
    :param scaler: A scaler object which must have been fit first
    :return ftrajs: A dict of scaled trajectories, represented as np.arrays of shape (n_frames, n_features)
    """
    sctrajs = {}
    for k, v in ftrajs.items():
        sctrajs[k] = scaler.partial_transform(v)
    return sctrajs
