ADXL345 accelorometer: what kind of numbers should i expect tapping sensor?

Here's some more sample data just tapping on the chip, the PCB is sitting flat on a desk and I am tapping right on top of the 16 pin LQFN chip, trying not to touch the analog pins with my fingers. looks like you can spike around 2 G's

I also held it in the air by the wires attached, and tapped it, it got considerable more G's this way, so i imagine if this is mounted cantilever on some stand off's by the screw holes on the PCB, you would get maybe closer to 10 G's with some hard tapping, the type you would do on your mouse if you were mad at the computer.