-#' times_from_H+1_yersteday_to_Hnow,
-#' PM10_values_of_last_24h,
-#' exogenous_measures_of_last_24h,
-#' exogenous_predictions_for_next_24h)
+#' level_hat=predicted_level,
+#' exo_hat=predicted_exogenous)
+#' # When a day ends:
+#' data$append(
+#' level=observed_level,
+#' exo=observed_exogenous)
+#' # And, at every hour:
+#' data$append(
+#' time=current_hour,
+#' value=current_PM10)
+#' # Finally, a bit before predict_from hour: