Last Update: 5/19/2020
Starting with Origin 9.1, you can add drop lines directly to a Line/Line+Symbol plot using controls on the Drop Lines tab of Plot Details dialog.
From Origin 2020b, you can specify adding drop lines at special positions by Show at Specififed Points Only edit box on the Drop Lines tab.
Syntaxes to specify drop line positions...
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Prior to Origin 9.1, adding drop lines to a 2D line plot required the following work-around:
Keywords:drop lines, line + symbol, symbol, symbol size