Salary expectations in the federal government

I was recently contacted by a recruiter about a job opening. He caught me off-guard (mistake on my part) with the question, “What are your salary expectations?”
Like any excellent scientist would do, rather than giving him an answer, I turned his question into another question, “Well, what salary should I be expecting from this position?”
Perhaps, the most transparent of the various job sectors for salary information is the federal government. Here is the salary information I have found online and from talking to colleagues at the NIH: