Adds a chart-specific field to a point after the line core has read its
x, y and z from the same datum.
A survival curve is a line whose samples also say whether the time was
censored and how wide the confidence band is there. Those live on the very
datum the core has just resolved, and the core is the only place that knows
which datum produced which point across all three of its extraction
patterns — so the extension point is here rather than a second pass that
would have to guess the pairing.
Adds a chart-specific field to a point after the line core has read its
x,yandzfrom the same datum.A survival curve is a line whose samples also say whether the time was censored and how wide the confidence band is there. Those live on the very datum the core has just resolved, and the core is the only place that knows which datum produced which point across all three of its extraction patterns — so the extension point is here rather than a second pass that would have to guess the pairing.