2a0b936b_logue_Format___Stellarium_Wiki_Header_Record_Description
[Name] Level [Offset] 16 [Type] int [Size] 4 [Description] 
Sets the level of sub-division of the geodesic sphere used to create the zones. 0 means an icosahedron (20 sizes), subsequent levels of sub-division lead to numbers of zones as described in section Zones
Star Catalogue Format - Stellarium Wiki