Hi,
what function are you trying to do this with? Is this something of your own design in which case, can you attach it here, or is it simply the ArrayToFile function?, in which case, you need to set the number of elements in a group so that the data is inserted vertically (number of groups = number of elements and set to write groups as rows, or number of groups = 1 and set to write groups as columns).
Hope that helps
S.
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