Issue on page 7-eeg/erp_avg_reref.ipynb

[lek-hong-godot]

Under the section "Batteries and Dipole Sources", there is this paragraph linked to the DipoleContourPoint.svg image on Wikimedia Commons:

Consider the different scalp locations indicated by letters in the figure above. If our reference were located at C**,** then the measurement at A would be negative, because the effect of the dipole is zero at C and negative at A. Likewise, the measurement at B would be positive.

I am not super familiar with dipoles, but in the final sentence, which refers to measuring B from C, should the value be negative, since B and A are both in the blue regions? In other words, should we replace B with D or E in the final sentence?