View g 2D intensity plot
g View (F2)
This will change the view from 1D single plot lines to a 2D picture of the Y values of the data sets. Each line represents one data set.
The X value will be the X value of the original plots, the Y value represents the data set to which the horizontal line belongs (you can give these a more meaningful value by using the y-axis Gain and Offset options), and the color of the plot represents the Y value of the data set, where by default black represents the lowest value and white represents the highest value. If no set is selected, all sets will be displayed in the graph window. If some sets are selected, only the selected plots will appear in the graph window. In order to change the appearance of the plot you can adjust the:
g Custom settings
Here you can set the values to which the different colors belong, as well as the colors themselves. The "auto values" option will set the lowest color to the lowest value present in the plot, the highest color to the highest value present, and distribute all other colors in between.
A "smoothing" option is also present: when checked the graph will smooth its appearance, to give the graph a less "checkered" look.
Tip: you can set these color values also when you're in the 1D view mode. Looking at the plots in 1D mode can give you a good clue to the values to which you want to set the different colors. Then, switching to 2D mode the new settings will be instantly active.
Speeding things up
If your data sets are not identical in number of data points, as well as in X start values and X end values, they will be resampled on the fly to display them correctly. This resampling can be time consuming, and is done every time the display changes. To prevent this automatic resampling you can resample the plots yourself with resample to source plot.