I'm building something pretty much exactly the same as a reputation graph / summary on the SO user page.

![rep][1]

I'm using this API call to retrieve the reputation history: [/2.0/users/109102/reputation?site=stackoverflow][2]

..and I see this JSON response:

    {
      "items": [
        {
          "user_id": 109102,
          "post_id": 4772273,
          "post_type": "question",
          "vote_type": "up_votes",
          "reputation_change": 10,
          "on_date": 1334436306
        },
        {
          "user_id": 109102,
          "post_id": 1252848,
          "post_type": "answer",
          "vote_type": "up_votes",
          "reputation_change": 280,
          "on_date": 1334135022
        },

Why do I a reputation change of 280 in the second `item`.  Should that correspond with the 10 rep change I see as the 2nd last green bar on the graph?

  [1]: https://i.sstatic.net/JLBbZ.png
  [2]: http://api.stackexchange.com/2.0/users/109102/reputation?site=stackoverflow