simulation box

Dear all,
a=b=4.99 and c=17.06 and alpha=beta= 90 and gamma=120, for 222 box
what is xlo, xhi, ylo, yhi, zlo, zhi, xy, xz and yz?
If I write ylo=0 and yhi=bsingamma=8.64 and then I introduced each position in read data file for example in y direction min is 0 and max is 9.6.
Is it ok?
yhi less than max in atom position?

I really appreciate you if help me.