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+====== Babelomics' formats: Expression Data Matrix ======
+[[Babelomics]] stores expression measurements (intensity measurements in the case of microarray data) in a matrix format. Each of those matrices contains the measurements of several arrays in an experiment. Each array is sorted in a column and each gene is ordered in a row.
+All arrays in the experiment are assumed to be of the same type and therefore to have the **same gene identifiers**. This gene identifiers are stored in the first column of the data matrix, naming its rows.
+This matrix structures are saved in plain **text** files. The columns are separated by **tabs** and the rows are separated by a **newline** or carriage return. An **end of line** is also needed at the very **end of the file**. Reading and rewriting this data should be straight forward by using any **spreadsheet**.
+Almost any line in the file starting with the symbol **#** is considered a //comment line// and is not used for computations. **Exceptions** are lines starting with a [[Babelomics_tags|Babelomics reserved words]] which also contain the **#** symbol.
+**Empty lines** are not allowed in the data files. Please make sure to take them out or to comment them using **#** before submitting your data or you may get unexpected errors.
+An example of expression data file with the above mentioned structure would look like this:
+      gene1	10.23	9.98	10.41	10.55	10.65	9.69
+      gene2	10.51	9.74	10.65	10.63	10.43	10.35
+      gene3	9.89	10.02	9.89	11.03	10.21	10.77
+      gene4	10.25	10.83	8.94	10.16	10.49	10.46
+      gene...	...	...	...	...	...	...