plotStripDashStyle

Specifies the line style of the plot gridline. May be one of the following values:

• Solid
• ShortDash
• ShortDot
• ShortDashDot
• ShortDashDotDot
• Dot
• Dash
• LongDash
• DashDot
• LongDashDot
• LongDashDotDot

axisX: {
    plotStripColor: 'red',
    plotStripDashStyle: 'ShortDashDot',
    plotStripWidth: 2
}

This setting is demonstrated in the following example.