deletions | additions       diff --git a/untitled.md b/untitled.md  index 1288c9f..b823961 100644  --- a/untitled.md  +++ b/untitled.md 
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- Missing data are left as empty cells.  - No comments are allowed in the Data and Metadata worksheets but other worksheets can be added for this purpose.  The Data worksheet: src="PDS_data.png">
 src="https://github.com/PBrockmann/Paleo_Data_Spreadsheet/blob/master/PDS_data.png">
  The Metadata worksheet: src="PDS_metadata.png">
 src="https://github.com/PBrockmann/Paleo_Data_Spreadsheet/blob/master/PDS_metadata.png">
  Notes:  1. Currently, pandas does not yet support the reading and the writing of ODS (Open Document Spreadsheets) but there are many requests for this feature and it should be feasible soon ([pandas/issue 2311](https://github.com/pydata/pandas/issues/2311)).