What do Animation Clip Summary labels mean?

When viewing an animation clip in the Inspector there is a small block of text with a summary of the animation clip. What do each of these labels mean? Curves pos, rot, scale, total are pretty obvious, but what about “constant” or “stream”? It seems like “Stream” is much too high, and constant doesn’t look great either. Thanks for any help[35241-screen+shot+2014-11-05+at+10.05.07+am.png|35241]

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