Primary Color Correction: Color Control Primer - The Art and Technique of Digital Color Correction - page 92

Fig. 3.24 Chicago's Field Museum of Natural History with the
proper white balance.
Fig. 3.25 Final Cut Pro's internal vectorscope display of the
properly white balanced Field Museum shot.
Fig. 3.26 The same shot with an improper blue white balance
Fig. 3.27 Final Cut Pro vectorscope image of the improper, blue
white balanced image. Notice that the trace aims more toward
the cyan/blue vector.