>>163
ぐあっ,,確かに。

http://www-utheal.phys.s.u-tokyo.ac.jp/docs/manual/fitsio/node40.html
＞defines certain special values that are used to represent such
＞quantities as Not-a-Number (NaN), denormalized, underflow,
＞overflow, and infinity.

この辺が答えかな？　つーかあなたのような人が先輩か先生だったらなあ・・・