The data set IRON contains data from Draper and Smith (1998, p. 98).(footnote 1) Thirteen specimens of 90/10 copper-nickel alloys were tested in a corrosion-wheel setup in order to examine corrosion. Each specimen had a certain iron content. The wheel was rotated in salt sea water at 30 ft/sec for 60 days. Weight loss was used to quantify the corrosion. FE represents the iron content, and LOSS denotes the weight loss in milligrams/square decimeter/day. 
data iron;
   input Fe Loss @@;
   datalines;
0.01 127.6   0.48 124.0   0.71 110.8   0.95 103.9
1.19 101.5   0.01 130.1   0.48 122.0   1.44  92.3
0.71 113.1   1.96  83.7   0.01 128.0   1.44  91.4
1.96  86.2
;
FOOTNOTE 1:  Draper, N. and Smith, H. (1998), Applied Regression Analysis, Second Edition, New York: John Wiley & Sons. [arrow]