Fig. 4. Mean ultraviolet polarization sensitivity of rainbow trout (±1 standard error). Two different recording techniques were used, electroretinogram (ERG) and compound action potential (CAP) recording (solid circles). S_v is represented by squares and S_h by diamonds (see Table 2 for weighting coefficients). Dashed lines connect the symbols. (A) ERG PS (N=21). The solid line connects the sensitivity points representing the intermediary peaks. (B) CAP PS (N=5). For both figures, a 360 nm linear polarized stimulus in 15° e-vector increments was used. Note the differences in sensitivity between the two curves at 45° and 135°.