Installation-guide.md

@@ -7,6 +7,11 @@ Initial steps
 4. Go in the newly created directory 
 5. Fill .yafits.bashrc configuration file according to your needs ( the file is self-documented )
 
+By default the application will use 3 ports :
+* 3022 for the UI  
+* 4252 for the fits file server
+* 30000 for the    spectral lines server  
+
 Installation without spectroscopic data
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