Find X values at a specified Y value over a region of interest in a data plot.

Purpose
This app can be used to find X values at "level crossings" (a specific Y value), over a region of interest within a data plot.
Multiple data plots in the layer is also supported.

Installation
Download the file "Level Crossing.opx", then drag-and-drop the file onto the Origin workspace.

Operation

1. With a graph window active, click the "Level Crossing" icon in the Apps panel. A dialog will open. The dialog box provides several options.
2. Click the Help button in the top right corner of the dialog box to open the help file for an explanation of dialog settings and an example.
3. If you have multiple data plots in the layer, there is an option to output the level crossing points for all data plots.

v1.5: Support for nonlinear axes
v1.4: Support for deadtime points, need version higher than Origin 2019b (not included)
v1.3: Support for Origin regular version
v1.2: Support output for all curves in the layer
v1.1: Add warning for non-monotonic data