stem-length	group
25.2	control
29.5	control
30.1	control
30.1	control
30.2	control
30.2	control
30.3	control
30.6	control
31.1	control
31.2	control
31.4	control
33.5	control
34.3	control
24.7	stress
25.7	stress
26.5	stress
27.0	stress
27.1	stress
27.2	stress
27.3	stress
27.7	stress
28.7	stress
28.9	stress
29.7	stress
30.0	stress
30.6	stress