this.seriesVisibilityChangeNotifier = new Notifier<SeriesVisibilityChangeMessage>();
this.harmonicSearchNotifier = new Notifier<HarmonicSearchResultMessage>();
this.seriesCreationNotifier = new Notifier<SeriesCreationMessage>();
this.obsListFileSaveDialog = new DelimitedFieldFileSaveChooser();
this.imageSaveDialog = new PNGImageFileSaveChooser();
// These (among other things) are created for each new star.
this.validObsList = null;
this.invalidObsList = null;
this.validObservationCategoryMap = null;