Application size when published in AppStore is 3 times larger than size of .ipa in ad-hoc mode

Hi,

I'm using TestFlight during distribution of my app among testers. The size of ipa is little less than 7Mb. After AppStore publication the size of my app became 19Mb. I've checked compilation options. They all are the same in both cases. Could you please tell me, what the reason for such difference in application sizes can be?

Alexander