Attributes . ECO2D, GCO2D, GCO4C, GCO4D, GCO4S, SG4C, SG4D, SG6C, SG6D, VC4EC, VC4ED, VC4ES, VC4GC, VC4GD, VC4GS, VC6EC, VC6ED, VC6ES, VC6GC, VC6GD, VC6GS . Names