The VLF Group is committed to the free flow of scientific data and supports a fully open data policy. We request to be given the chance to participate in any studies for which these data are helpful and to participate in publications. At a minimum, we request that you inform us before you publish these data or present them at a meeting or to the public. The data are provided "as is" and so have known instrumental effects and "bugs". We are willing to provide calibration information and to fulfill reasonable requests to produce customs plots of the data. Please contact us with any questions regarding the data and its interpretation.