File:Vostok Petit data.svg

This W3C-unspecified plot was created with Gnuplot.

This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Generated as svg. The original can be viewed here: Vostok-ice-core-petit.png: . Modifications made by Autopilot.

Data sets used are:

• ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/deutnat.txt
• ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/co2nat.txt
• ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/dustnat.txt

gnuplot commands:

unset multiplot
set term svg size 1024,768
set output "vostok-data.svg"

set border 3
set xtics nomirror
set ytics nomirror
unset xlabel
unset ylabel

set grid y
set multiplot layout 3,1

set ylabel "°C"
plot [-425:0] [-10:4] \
        "deutnat.txt" \
        using (-$2/1000):4 \
        title "Temperature variation (ΔT)" \
        ls 3 \
        with lines

set ylabel "ppmv"
plot [-425:0] \
        "co2nat.txt" \
        using (-$1/1000):2 \
        title "Carbon Dioxide" \
        ls 2 \
        with lines

set xlabel "Thousands of years ago"
set ylabel "ppm"
plot [-425:0] \
        "dustnat.txt" \
        using (-$1/1000):2 \
        title "Dust concentration" \
        ls 1 \
        with lines

After executing gnuplot, the resulting SVG file was manually changed to

• remove the negative signs for the x axis values
• change the hyphen-minus characters in the temperature axis values to proper minus sign characters

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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

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Original upload log

This image is a derivative work of the following images:

• File:Vostok-ice-core-petit.png licensed with Cc-by-sa-3.0-migrated, GFDL
  • 2006-02-15T20:38:10Z Maksim 598x441 (31557 Bytes) La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Graph of [[carbon dioxide|CO2]], [[temperature]], and dust concentration measured from the [[Vostok, Antarctica]] [[ice core]] as reported by Petit et al.

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