ForceSensor zoom do not call to readFile, just use previous calculations (fsAI)
For not elastic it was ok to readFile because we use the Force and we can read some rows to get and graph i.
For elastic we calculate displacement with a smoothing on force, so we cannot rely on local zoom, we need all the signal to obtain data. So on zoom do not readFile, just use previous calculations and show what is from A to B.