Time Callibration of Histograms

Dear ALL,
I am relatively new to Root and C++. I am having issues with trying to calibrate the x-axis–change it from channels to units of time–on my histograms; we have already figure out which channels correspond to what times, i.e. channel 371 is 94 ns, channel 1341 is 200 ns, and so on. I beileve SetEntry might be the right approach, but it hasn’t worked for me yet. I would appreciate any advice.
Thank You,
Shaquann S.

So is using an approxiamte linear fit of time with respect to channel the best option? Also, Thank You Wile E. Coyote.