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Add excel feature docs.
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|+title: Handling unsupported Excel features|
|+### The Problem|
|+PANDA supports importing Excel files, however, certain features may cause data to fail to import.|
|+As a proprietary data format Excel files have a long and complicated history. PANDA does not can support all the features that Excel does. Some unsupported features are handled automatically, for example:|
|+* The date `12/30/2011` in Excel will become `2011-12-30` in PANDA.|
|+* A number shown rounded in Excel, `12`, will be expanded in PANDA, `12.011113`.|
|+* A value with prepended zeroes, `000097`, will be simplified to `97`. (If the column contains only numbers and the leading zeroes were applied with a format.)|
|+* When importing formulas, such as `=B1+5` PANDA will store the computed value only, `10`.|
|+* Pivot tables and other embedded objects will be discarded.|
|+In addition to these limitations only the first worksheet of an Excel workbook will be imported.|
|+### The Solution|
|+Excel files that fail to import should be resaved as CSV files prior to import.|
|+If an Excel file fails to import for any reason the only solution is to export it to a CSV. This can be done in Excel or in another spreadsheet application, such as [LibreOffice](http://www.libreoffice.org/). In the latter simply choose **Save As** from the **File** menu and then select "Text CSV" as the file type. If prompted with advanced options (delimiter, etc.) you may leave them set to the defaults.|