【IRAF】ellipse

Website:   http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?ellipse

IMPORTANT:
  you need open ds9 before use iraf.
  Need to run in xgterm to use interactive mode.


run  ellipse  in interactive model.
and clip x to define the center clip f to fit.


TO check the output table.   use tdump table.tab
tdump可以设定一个变量 tdump.columns=‘x0,y0,SMA,ELLIP,INTENS,INT_ERR,RMS,PA’
tdump q.tab > q.txt就可以把那些值输出到一个q.txt文件里面


Other sources：
（1） image examples：
http://www.ast.uct.ac.za/~sarblyth/TullyFisher/ellipseEg/EllipseEg.html