get data every 2 columns at a time in excel

[KenLabView]

i would like to read the following excel file and plot every 2 columns at one time given an interval. for example at 7 am i ll plot corresponding I and V and at 8 am so on.. but even though i programmed my VI to read by increasing index 0,2,4 so on it stops when it iterates half way i.e i=12..this only plots half the data..im reading from delimited text file..how can i read from a true xls file and plot all the data as desired?

[RavensFan]

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