mpib_sp_eeg/sub-28/eeg/sub-28_coordsystem.json

{
    "EEGCoordinateSystem": "CapTrak",
    "EEGCoordinateUnits": "m",
    "EEGCoordinateSystemDescription": "The X-axis goes from the left preauricular point (LPA) through the right preauricular point (RPA). The Y-axis goes orthogonally to the X-axis through the nasion (NAS). The Z-axis goes orthogonally to the XY-plane through the vertex of the head. This corresponds to a \"RAS\" orientation with the origin of the coordinate system approximately between the ears. See Appendix VIII in the BIDS specification.",
    "AnatomicalLandmarkCoordinates": {
        "NAS": [
            -3.2790910652126188e-18,
            0.09777966721066005,
            -7.703719777548943e-34
        ],
        "LPA": [
            -0.08624325555484708,
            2.8922116099605284e-18,
            7.703719777548943e-34
        ],
        "RPA": [
            0.08012701037126568,
            -2.6871002048365688e-18,
            -2.3881531310401725e-32
        ]
    },
    "AnatomicalLandmarkCoordinateSystem": "CapTrak",
    "AnatomicalLandmarkCoordinateUnits": "m"
}