I have the data in .m file that is of course that matlab file that is built when reading a analog in card 6052.the data is simple in two columns and servral lines that is of two channels.and also it was taken at when scans to read at a time=1 at 2ks/s.when i plot this data in Matlab6p1 the x-axis show the number of scans instead of time in seconds so how to do x-axis in seconds accuratly?