@property
def C_t(self):
    if self._dynamic_composition:
        return pd.DataFrame(self._dynamic_composition, columns=(['Time[d]'] + list(self.components.IDs)))
    else:
        return None
@property
def C_t(self):
    if self._dynamic_composition:
        return pd.DataFrame(self._dynamic_composition, columns=(['Time[d]'] + list(self.components.IDs)))
    else:
        return None