wt heart logweight logheart species
 35   245      3.56     5.50    styx
 42   255      3.74     5.54    styx
 71   525      4.26     6.26    styx
 65   425      4.17     6.05    styx
 63   425      4.14     6.05    styx
 64   440      4.16     6.09    styx
 45   350      3.81     5.86    styx
 54   300      3.99     5.70   delph
 59   350      4.08     5.86   delph
 50   320      3.91     5.77   delph
 42   240      3.74     5.48   delph
 55   305      4.01     5.72   delph
 37   220      3.61     5.39   delph
 47   310      3.85     5.74   delph
 40   210      3.69     5.35   delph
 52   350      3.95     5.86   delph