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@@ -109,9 +109,16 @@ NOTE: complete and detailed documentations are badly needed! Useful Links ------------ +* [CIAO](http://cxc.cfa.harvard.edu/ciao/) +* [Chandra CALDB](http://cxc.cfa.harvard.edu/ciao/download/caldb.html) * [Chandra Data Archive](http://cda.harvard.edu/chaser/) * [NED search by name](http://ned.ipac.caltech.edu/forms/byname.html) +* [NED search near position](https://ned.ipac.caltech.edu/forms/nearposn.html) * [SIMBAD](http://simbad.u-strasbg.fr/simbad/) +* [HEASoft](https://heasarc.gsfc.nasa.gov/lheasoft/) +* [XSPEC](https://heasarc.gsfc.nasa.gov/lheasoft/xanadu/xspec/index.html) +* [QDP/PLT User's Guide](https://heasarc.gsfc.nasa.gov/ftools/others/qdp/qdp.html) +* [FTOOLS](https://heasarc.gsfc.nasa.gov/ftools/) * [HEASARC nH tool](https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/w3nh/w3nh.pl) |