Minecraft wiki entry for Development_versions, associated text: Added two new lines: Multinoise and Terrain.
Only appear if the dimension where the player is uses the multi-noise biome source type.
Multinoise lists the parameters used at the player's position in order to place a biome. C is continentalness, E is erosion, T is temperature, H is humidity and W is weirdness.
Terrain lists values related to terrain generation.[more information needed]