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                    GogTrendLine;
                    GogTrendLineType;
GogTrendLine *      gog_trend_line_new_by_name          (char const *id);
GogTrendLine *      gog_trend_line_new_by_type          (GogTrendLineType const *type);
GHashTable const *  gog_trend_line_types                (void);
GObject +----GogObject +----GogStyledObject +----GogTrendLine +----GogRegCurve +----GogSmoothedCurve
typedef struct {
	char *engine;
	char *name;
	char *description; /* untranslated */
	GHashTable *properties;
} GogTrendLineType;
GogTrendLine * gog_trend_line_new_by_name (char const *id);
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GogTrendLine * gog_trend_line_new_by_type (GogTrendLineType const *type);
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