Pre-defined energy group structures

Name	Groups	Description
default2	2	Default 2-group structure
defaultmg	70	Default multi-group structure
nj2	240	CSEWG 239 group structure
nj3	30	LANL 30 group structure
nj4	27	ANL 27 group structure
nj5	50	RRD 50 group structure
nj8	35	Laser-thermos 35 group structure
nj9	69	EPRI-CPM 69 group structure
nj11	70	LANL 70 group structure
nj14	100	Eurlib 100-group structure
nj16	174	Vitamin-e 174-group structure
nj17	175	Vitamin-j 175-group structure
nj18	172	XMAS 172-group structure
nj19	33	ECCO 33-group structure
nj20	1968	ECCO 1968-group structure
nj21	315	Tripoli 315-group structure
nj22	172	XMAS lwpc 172-group structure
nj23	175	VIT-J lwpc 175-group structure
wms69	69	WIMS 69-group structure
wms172	172	WIMS 172-group structure
cas70	70	CASMO 70-group structure
cas40	40	CASMO 40-group structure
cas25	25	CASMO 25-group structure
cas23	23	CASMO 23-group structure
cas18	18	CASMO 18-group structure
cas16	16	CASMO 16-group structure
cas14	14	CASMO 14-group structure
cas12	12	CASMO 12-group structure
cas9	9	CASMO 9-group structure
cas8	8	CASMO 8-group structure
cas7	7	CASMO 7-group structure
cas4	4	CASMO 4-group structure
cas3	3	CASMO 3-group structure
cas2	2	CASMO 2-group structure
mupo43	43	MUPO 43-group structure
scale44	44	SCALE 44-group structure
scale238	238	SCALE 238-group structure