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### B.20.2 Examples

Here are some examples of `plot2d` in use:

    stilts plot2d in=cat.xml xdata=RMAG-BMAG ydata=BMAG

  Plots a colour-magnitude diagram. Since no `omode` or `out` value has been specified, the plot is posted directly to the graphics display for inspection. By adding the parameter `out=xyplot.eps` the plot could be written to an Encapsulated Postscript file instead.

  The generated plot is here.

    stilts plot2d in=6dfgs_mini.xml xdata=RMAG-BMAG ydata=BMAG
                  subset1=SGFLAG==1 name1=galaxy colour1=blue   shape1=open_circle
                  subset2=SGFLAG==2 name2=star   colour2=e010f0 shape2=x size2=3
                  xlo=-1 xhi=4.5 ylo=10 yhi=20 xpix=500 ypix=250
                  out=xyplot2.png

  Plots a colour-magnitude diagram with multiple subsets. The subsets are labelled "`1`" and "`2`" with separate sets of parameters applying to each. The selections for the sets are given by the `subset*` parameters; set 1 is those rows with the SGFLAG column equal to 1 and set 2 is those rows with the SGFLAG column equal to 2. The boundaries of the plot in data coordinates are set explicitly rather than being determined from the data (this is faster) and the plot size in pixels is also set explicitly rather than taking the default values. Output is to a PNG file.

  The generated plot is here.

    stilts plot2d in1=iras_psc.fits cmd1='addskycoords fk5 galactic RA DEC GLON GLAT'
                  xdata1=GLON ydata1=GLAT
                  auxdata1=FNU_100 auxlog=true auxflip=true size1=0 transparency1=3
                  in2=messier.xml   cmd2='addskycoords fk5 galactic RA DEC GLON GLAT'
                  xdata2=GLON ydata2=GLAT
                  txtlabel2=RADIUS>16?("M"+ID):"" cmd2='addcol SIZE sqrt(RADIUS/2)'
                  xerror2=SIZE yerror2=SIZE
                  subset2a=true hide2a=true colour2a=black errstyle2a=ellipse
                  subset2b=true hide2b=true colour2b=black errstyle2b=filled_ellipse
                                transparency2b=6
                  xlabel='Galactic Longitude' ylabel='Galactic Latitude' title='The Sky'
                  legend=false grid=false fontsize=12 fontstyle=bold-italic
                  xlo=0 xhi=360 ylo=-90 yhi=+90 xpix=600 ypix=300
                  out=skyplot.png

  You can do quite complicated things.

  The generated plot is here.

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Next: plot3d: Old-style 3D Scatter Plot
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STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk