Certain instruments and software indicate no-data values (NDV) using special strings instead of blanks (e.g. -99999). To prevent importing those stings, you can provide a general NDV to be applied to all properties of the template or an NDV to individual user-created properties on import templates.
Note that in case of the presence of both on a template, the individual NDV will be used instead of the general NDV for that property.
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