Read three arrays of the same size from a dat file.
Note
This function can be used to read only special arrays which were written
using the write functions in pyflct or the IDL IO routines
as given on the FLCT source website.
order ({"row" | "column"}, optional) – The order in which the array elements are stored that is whether they are stored as row
major or column major. Defaults to “row”.
