func (b *SparkChart) SetTop(top float64) {
	b.mtx.Lock()
	defer b.mtx.Unlock()

	b.topValue = top
}
func (b *SparkChart) SetTop(top float64) {
	b.mtx.Lock()
	defer b.mtx.Unlock()

	b.topValue = top
}
func ( b * SparkChart ) SetTop ( top float64 ) { b . mtx . Lock ( ) defer b . mtx . Unlock ( ) b . topValue = top }
// SetTop sets the theoretical highest value of data flow
// to scale the chart
SetTop sets the theoretical highest value of data flow to scale the chart