Interface ScatterTrendline

Stroke color (default: the series color)

CSS-px dash lengths [on, off] or [on, off, on, off] ([a] = [a, a]); default solid

Polynomial order, an integer 2-6 (default 2; Excel's polynomial trendline also ends at 6)

Series ids to fit, one line each (default: every series, like one ecStat regression per data set)

Regression model: 'linear' y = a + bx, 'exponential' y = a·e^(bx) (fits y > 0 only), 'logarithmic' y = a + b·ln(x) (fits x > 0 only), 'polynomial' of order

Stroke width in CSS px (default 2)