Style of minor grid line (Solid, Dash, Dot, DashDot, DashDashDot, DashDotDot, DashDashDotDot, LongDash, LongDashDot, LongDashDotDot, None, Automatic). Default: Dot

String

&MinorGridlineStyle={String}

http://static.et4.de/ElevationProfileChart/Go.ashx?Experience=develop&globalid=4926A3E100ED621DA4AA7513FA6CAE88&ShowMinorAxis=true&MinorGridlineStyle=LongDash