Recalling Spreadsheets and appending results into 1 file.

Hi,
i am in a stage of my program where i have to do numerical analysis on a set of data collected by an Optical spectrum analyser... the data has been saved in multiple spreadsheets... (each with a row for the wavelengths, x-values, and power, y-values)...i need to get the power values and put them all in 1 spreadsheet file, with the wavelngth values in the first row.
so multiple 2D spreadsheets: Wavelength: x1 x2 x3 .....
   Power 1 : P1 P2 P3....
   Wavelngth: x1 x2 x3...
   Power 2 : p1 p2 p3...
Will turn to: Wavelength: x1 x2 x3...
Power11 P2 P3...
Power21 p2 p3...
attached below is my attempt at doing this, which doesnt seem to work. The loops are present so that 'read from spreadsheet' vi recalls all the spreadhseets...which it does do... but i don't know how to improve it so that all the files succesfully append into 1 2D array (as shown above).
Please can someone help me figure out how to do this (recall multiple spreadsheets and then save into 1). right now only the files being recalled in the last loop iteration are saved into the single spreadsheet.
the file paths of the spreadsheets are all dependent on the number (N) so the file paths are such that 00.txt,01.txt,02.txt,03.txt...0N.txt, 10.txt,11.txt...1N.txt,20.txt,21.txt... etc ...NN.txt and teh final file will be RESULTS.txt (as seen in the pic)
Any input will be greatly appreciated, it seems like an easy concept, but the answer totally evades me.
thanks a lot,
Asiri
Attachments:
Savespreadsheet.jpg ‏121 KB

as you can see in the image, i have used the required VIs to recall and save the spreadsheets, what i am having problems with is appending ALL of the spreadsheets, my loops are not working properly, i only append a select number of spreadsheets/arrays together dependent on the loop iterations,
perhaps its something wrong with the way i got everything wired? i index at the outer loop, however this information gets lots in subsequent iterations... what i need ideally is some sort of VI which inserts sub arrays into consequative rows in an array though just one input (such as in my loops).
any suggestions are greatly appreciated.
thank you!
asiri
Attachments:
Savespreadsheet.jpg ‏121 KB

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