I actually expose it at 160. Not only is it more like an ISO 200 film, but replenished Xtol loses about 1/2 stop compared to Xtol 1+1, so 160 gives me adequate shadow detail for normal contrast. In high contrast I expose it at 100, and low contrast at 320-400, and then I obviously adjust developing time accordingly, so that I can fit the negatives to the paper I use.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh