These files support the analysis described in the paper

  "Human hair from the wreck of HMS Erebus of the Franklin Expedition, 1845:
   elemental chemistry revealed by double-ablation LA-ICP-MS"

by

   Adrian W. Bowman
   School of Mathematics & Statistics, The University of Glasgow, Glasgow, UK

   Jennie R. Christensen
   TrichAnalytics Inc., Saanichton, British Columbia, Canada

   Charles Dagneau
   Underwater Archaeology Team, Parks Canada, Ottawa, Canada

   Despoina Kavousanaki
   Parks Canada Agency, Ottawa, Canada

   Keith Millar
   School of Health & Wellbeing, The University of Glasgow, Glasgow, UK

   Jonathan Moore
   Underwater Archaeology Team, Parks Canada, Ottawa, Canada

The plain text file "medians.txt" contains the median measurement of a variety of different elements on each hair from several different source groups. There are five columns in the file, with the first column providing a simple numerical index for each line of data. The first line of the file gives the names of the four variables:
   "element" "hair" "source" "median"
In each of the following rows, the index and the first three variables are given as text strings. The final median value is given as a numerical value.

The plain text file "plots.R" contains code for the statistical computing environment R (www.r-project.org) to reproduce Figures 5, 6 and 7 of the paper, where these medians are plotted.