Update src/modality-specific-files/microelectrode-electrophysiology.md

Co-authored-by: Yaroslav Halchenko <[email protected]>

src/modality-specific-files/microelectrode-electrophysiology.md

@@ -112,8 +112,6 @@ Fields relating to the ephys probe and electrode  positions:
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 ### **Allowed 2D coordinate systems**
 
 If electrodes are localized in 2D space (only x and y are specified and z is `"n/a"`), then the positions in this file MUST correspond to the locations expressed in pixels on the photo/drawing/rendering of the electrodes on the brain. In this case, `ephysCoordinateSystem` MUST be defined as `"Pixels"`, and `ephysCoordinateUnits` MUST be defined as `"pixels"` (note the difference in capitalization). Furthermore, the coordinates MUST be (row,column) pairs, with (0,0) corresponding to the upper left pixel and (N,0) corresponding to the lower left pixel.