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Date: Mon, 13 Jun 2016 13:32:08 -0700 (PDT)
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Subject: How to plot a 2D contour diagram with only 2 Column?
From: Wei PENG <w.peng1125@gmail.com>
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Xref: csiph.com comp.graphics.apps.gnuplot:3343

I have some diffraction data with different temperature. The data files is only two columns(x: degree, y: intensity). It is possible I use this series data to plot a 2d contour diagram? (Maybe I can regard temperature as z)

The diagram should be like this.(Figure 6)
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.86.174417

One of the data is like this, just intensity(y) is various for other files. 

    16.0000     2293.00000
    16.1000     2289.00000
    16.2000     2353.00000
    16.3000     2331.00000
    16.4000     2367.00000
    16.5000     2297.00000
    16.6000     2319.00000
    16.7000     2328.00000
    16.8000     2387.00000
    16.9000     2335.00000
    17.0000     2408.00000
    17.1000     2377.00000
    17.2000     2409.00000
    17.3000     2459.00000
    17.4000     2516.00000
    17.5000     2506.00000
    17.6000     2505.00000
    17.7000     2500.00000
    17.8000     2526.00000
    17.9000     2583.00000
    18.0000     2556.00000
    18.1000     2514.00000
    18.2000     2613.00000
    18.3000     2606.00000
    18.4000     2720.00000
    18.5000     2722.00000
    18.6000     2697.00000
    18.7000     2786.00000
    18.8000     2764.00000
    18.9000     2871.00000
    19.0000     3023.00000
    19.1000     3297.00000
    19.2000     3684.00000
    19.3000     3801.00000
    19.4000     3653.00000
    19.5000     3258.00000
    19.6000     3185.00000
    19.7000     2911.00000
    19.8000     2825.00000
    19.9000     2813.00000
    20.0000     2692.00000
    20.1000     2593.00000
    20.2000     2606.00000
    20.3000     2594.00000
    20.4000     2501.00000
    20.5000     2473.00000
    20.6000     2486.00000
    20.7000     2475.00000
    20.8000     2415.00000
    20.9000     2396.00000
    21.0000     2350.00000
    21.1000     2383.00000
    21.2000     2313.00000
    21.3000     2398.00000
    21.4000     2313.00000
    21.5000     2361.00000
    21.6000     2376.00000
    21.7000     2381.00000
    21.8000     2296.00000
    21.9000     2330.00000
    22.0000     2336.00000
    22.1000     2252.00000