Description and Syntax

Creates a horizontal or vertical reference line.
Syntax for creating a line perpendicular to the X-axis at an X-intercept:
REFERENCELINE X = x-axis-value | column | expression </option(s)>;
Syntax for creating a line perpendicular to the Y-axis at a Y-intercept:
REFERENCELINE Y = y-axis-value | column | expression </option(s)>;
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