static void put_mat_in_graph(gpointer key, gpointer value, gpointer user_data) {
struct xy_properties *propmap = user_data;
struct matdb_material *mat = value;
static void put_mat_in_graph(gpointer key, gpointer value, gpointer user_data) {
struct xy_properties *propmap = user_data;
struct matdb_material *mat = value;
propmap.yprop = g_string_new("E_g_Gamma");
propmap.graph = graph_widget_get_graph(GRAPH_WIDGET(graph));
g_hash_table_foreach(mdb->materials, &put_mat_in_graph, &propmap);
propmap.yprop = g_string_new("E_g_Gamma");
propmap.graph = graph_widget_get_graph(GRAPH_WIDGET(graph));
g_hash_table_foreach(mdb->materials, &put_mat_in_graph, &propmap);