Function show_graph 

fn show_graph(
    (InMut, state): (InMut<'_, Ui>, InMut<'_, GraphTab>),
    graph: Res<'_, Graph>,
    displayed_lines: Query<'_, '_, (Instance<DisplayedLine>, &mut DisplayedLine)>,
    stations: Query<'_, '_, (&Name, &mut Station)>,
    schedules: Query<'_, '_, &VehicleScheduleCache>,
    timetable_entries: Query<'_, '_, (&TimetableEntry, &TimetableEntryCache)>,
    time: Res<'_, Time>,
)