seriesDashStyle

Specifies the line style of area series line.May be one of the llowing:

Solid
ShortDash
ShortDot
ShortDashDot
ShortDashDotDot
Dot
Dash
LongDash
DashDot
LongDashDot
LongDashDotDot

seriesSettings: {
    splinearea: {
        seriesDashStyle: "ShortDot"
    }
}

This setting is demonstrated in the following example.