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diff --git a/src/crystfel_gui.h b/src/crystfel_gui.h
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+/*
+ * crystfel_gui.h
+ *
+ * CrystFEL's main graphical user interface
+ *
+ * Copyright © 2020 Deutsches Elektronen-Synchrotron DESY,
+ *                  a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *   2020 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * CrystFEL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef CRYSTFEL_GUI_H
+#define CRYSTFEL_GUI_H
+
+struct peak_params {
+	enum peak_search_method method;
+	float threshold;                /* zaef, pf8 */
+	float min_sq_gradient;          /* zaef */
+	float min_snr;                  /* zaef, pf8 */
+	int min_pix_count;              /* pf8 */
+	int max_pix_count;              /* pf8 */
+	int local_bg_radius;            /* pf8 */
+	int min_res;                    /* pf8 */
+	int max_res;                    /* pf8 */
+	float min_snr_biggest_pix;      /* pf9 */
+	float min_snr_peak_pix;         /* pf9 */
+	float min_sig;                  /* pf9 */
+	float min_peak_over_neighbour;  /* pf9 */
+	float pk_inn;
+	float pk_mid;
+	float pk_out;
+	int half_pixel_shift;           /* cxi, hdf5 */
+};
+
+
+struct crystfelproject {
+
+	GtkWidget *window;
+	GtkUIManager *ui;
+	GtkActionGroup *action_group;
+
+	GtkWidget *imageview;
+	GtkWidget *icons;      /* Drawing area for task icons */
+	GtkWidget *report;     /* Text view at the bottom for messages */
+	GtkWidget *image_info;
+
+	int cur_frame;
+
+	char *geom_filename;
+
+	int n_frames;
+	int max_frames;
+	char **filenames;
+	char **events;
+
+	int show_peaks;
+	struct peak_params peak_search_params;
+
+	GtkWidget *file_chooser;  /* Data location in "Find data" window */
+	GtkWidget *geom_chooser;  /* Data location in "Find data" window */
+	GtkWidget *type_combo;    /* Search pattern in "Find data" window */
+
+	GtkWidget *peak_vbox;     /* Box for peak search parameter widgets */
+	GtkWidget *peak_params;   /* Peak search parameter widgets */
+	struct peak_params original_params;
+};
+
+#endif