Update README.md

Author: cyriltasse

README.md

@@ -31,9 +31,14 @@ Notes:
 ### Creating a source file:
 A source file may either be in [ECSV](https://docs.astropy.org/en/stable/io/ascii/ecsv.html) format or a simple `csv` format of the following structure:
 ```
-<Target Name>,<RA-Deg>,<Dec-Deg>,<Source Type>
+Name ra dec
+# Name     ra          dec
+Deneb    20:41:25.9   +45:16:49
+etc   HH:MM:SS  DD:MM:SS
 ```
 
+or in fits table format
+
 ### Output:
 The output folder should countain the following files/folders:
 ```