subscripts and superscripts in limits of integrals

I have an integral with the limits being variables with a subscript. X2 (with the 2 being a subscript--I can't show it correctly here) as the upper limit and X1 (1 being a subscript) as the lower limit of the integral. I know I use the superscript sign to indicate an upper limit and the subscript sign to indicate a lower limit. But when I show the sub 2 that goes with the upper limit, would I do:
Superscript sign, X, then superscript sign, subscript sign and then the 2 to show this.

When I show the 1 subscript in the lower limit. Would I use: subscript sign, subscript sign, and then the 1 to do the Xsub1 in this lower limit.

Thank you for your help.