Which side of the point the bar runs to.
OptionalerrWhich of the point's values the bar is of: y, or a scatter's or bubble's x. A bar series
states none: its bars run along its values.
OptionalextOptionalminusEach point's amount below, for cust.
OptionalnoThe bar's ends are drawn with no cap.
OptionalplusEach point's amount above, for cust.
OptionalspOptionalunknownOptionalvalThe amount: a value, a percentage, or a number of standard deviations.
c:errBars: a bar about each point of its series, as far as an amount of error. The amount is a fixed value, a percentage of the point's value, standard deviations of the series' values (the bars then about their mean), their standard error, or each point's own fromplusandminus.