M.vtu Array explanation:

Anatomical Structure					LabelID	MaterialID
Ventricles								2		30,31
Atria									3 		32,33
Aorta									5 		39
Pulmonary Artery						6 		39
Left superior pulmonary vein			7 		39
Left inferior pulmonary vein 			8 		39
Right inferior pulmonary vein 			9 		39
Right superior pulmonary vein 			10 		39
Superior vena cava						11 		39
Inferior vena cava						12 		39
Mitral valve							13 		37
Tricuspid valve							14 		36
Aortic valve							15 		35
Pulmonary Aortic valve					16 		34
Left superior pulmonary vein orifice	17		38
Left inferior pulmonary vein orifice	18		38
Right inferior pulmonary vein orifice	19		38
Right superior pulmonary vein orifice	20		38
Superior vena cava orifice				21		38
Inferior vena cava orifice				22		38
Pericardium/Surrounding tissue 			23		60,61

EP.vtu Array explanation:

Anatomical Structure					MaterialID
Ventricle endocardium					1
Ventricle myocardium					2
Ventricle epicardium					3
Right atrial bulk tissue				32
Left atrial bulk tissue					33
Crista terminalis						72
Sinus node								73
Pectinate muscles						74
Bachmann bundle							75
Middle posterior bridge					76
Lower posterior bridge					77
Coronary sinus bridge					78
Left and right atrial appendage			79
Inferior Isthmus						80
