Difference between the lines

GDDM-PGF V2R1.3 Interactive Chart Utility

Difference between the lines

GDDM-PGF V2R1.3 Interactive Chart Utility
SC33-0328-01

Reference lines

Shaded charts are drawn either side of reference lines.

Datum lines

Datum lines are just lines across the chart.

(On line charts and polars with no shading, both appear the same.)

Remember the difference this way: reference lines rearrange the chart; datum lines do not.

Datum lines go on top of shading whereas reference lines are covered by it. So you can use a datum line on top of your reference line to highlight it.

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