Base class for sensor location readers.
Each subclass should provide x, y, z coordinates via the pos_x, pos_y, and pos_z attrbibutes.
Axes should follow the following convention:
x-axis: left -> right y-axis: anterior -> posterior z-axis: superior -> inferior
Pass arguments to ColumnData.
Get the sensor locations as an array.
Returns : | (nchannels x 3) array with coordinates in (x, y, z) : |
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