highly significantp<0.001
Pooling across all non-zero heading directions, the improvement was highly significant (p<0.001; paired t-test).
Pooling across all non-zero heading directions, the improvement was highly significant (p<0.001; paired t-test).
In contrast, for headings 30°, 60°, and 90°, the improvement was either significant or approaching significance (p = 0.02, p = 0.12, p = 0.04, respectively; paired t-test).