#define PES_UPPER 0x0002 // this is a head after "\~" in an ascending melody
#define FLEXA_LEFT 0x0004 // this is a head before "\~" in a descending melody
#define FLEXA_RIGHT 0x0008 // this is a head after "\~" in a descending melody
+#define AFTER_VIRGA 0x0010 // previous head was a virga
#endif /* GREGORIAN_LIGATURE_HH */