Data from a chemical experiment, from Marquardt and Snee (1975).
Table 13.2 in Bayesian Data Analysis.

temperature ratio contact conversion
1300   7.5  0.0120  49.0 
1300   9.0  0.0120  50.2 
1300  11.0  0.0115  50.5 
1300  13.5  0.0130  48.5 
1300  17.0  0.0135  47.5 
1300  23.0  0.0120  44.5 
1200   5.3  0.0400  28.0 
1200   7.5  0.0380  31.5 
1200  11.0  0.0320  34.5 
1200  13.5  0.0260  35.0 
1200  17.0  0.0340  38.0 
1200  23.0  0.0410  38.5 
1100   5.3  0.0840  15.0 
1100   7.5  0.0980  17.0 
1100  11.0  0.0920  20.5 
1100  17.0  0.0860  19.5