Minecraft wiki entry for Development_versions, associated text: Merged the "Terrain" and "Multinoise" row into the "NoiseRouter" row, with the format NoiseRouter T: data H: data C: data E: data D: data W: data PV: data AS: data N: data.
T, H, C, E, and W are the same with data from the former "Multinoise" row.
PV is the same with data from the former "Terrain" row.
D, AS, and N are currently unknown. [more information needed]