Fig. 4. Representative data record (for FB 155). The three lines represent the different fin positions. C_on, a position at the center of the fin directly over a superficial vein; D_on, a position at the distal tip of the fin directly over a superficial vein; C_off, a position at the center of the fin away from superficial veins. The data streams begin recording with the dorsal fin in air. At fin submergence, all three heat flux values increase, while skin temperature values simultaneously drop. The two areas between the vertical dotted lines represent the 2 min segments of the record analyzed.