A light-cone diagram in Gnuplot

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sketos
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Hello,

If you visit this link (http://maia.ice.cat/cosmocomp/bcn_workshop/woodward.pdf ) you will see in page 3 a light-cone diagram!

How is it possible to generate it in GNUPLOT?

Note: i have a "data.file" with points and the columms are:
1) z (redshift)
2)Right ascension (RA)

Simillarly with the graph in the above link,
Thanks!
 
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