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### B.21.2 Examples

Here are some examples of `plot3d` in use:

    stilts plot3d in=cat.xml xdata=RMAG ydata=BMAG zdata=VEL zlog=true

  Plots a 3-d scatter plot of red magnitude vs. blue magnitude vs. velocity; the velocity is plotted on a logarithmic scale. 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 plot3d in=sim1.fits xdata=x ydata=y zdata=z
                  cmd='addcol vel "sqrt(velx*velx+vely*vely+velz*velz)"' auxdata=vel auxlog=true
                  xpix=500 ypix=400 phi=50 theta=10 out=cube.jpeg

  Plots the x, y, z positions of particles from a file containing the result of a simulation run. Here an auxiliary axis is used to colour-code the points according their velocity. This is done by introducing a new `vel` column to the table using the `addcol` filter command, so that the `vel` column can be used as the value for the `auxdata` parameter. Alternatively, the given expression for the velocity could have been used directly as the value of the `auxdata` parameter.

  Additionally, the `phi` and `theta` parameters are given to adjust the orientation of the cube.

  The generated plot is here.

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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