This mode is also useful for learning about sampling and aliasing . Try setting the Virtual Source sine wave frequency to sub-multiples of the sampling frequency. Make the frequency a little higher or lower and observe what happens. Now try one forth of the sample rate, and so on. At intermediate frequencies you will see interesting criss-crossing sine waves appear in the point alignments, as the sine wave phase advances just the right amount between samples to make points from adjacent cycles seem to line up at a much lower frequency.
Straight lines connect data points.
This is the default line style for waveforms. A vertical line extends from the bottom of the trace up to each data point, like a high resolution bar-graph. This is the default FFT line style. This shows you each data point without any interpolation connecting the points as for Line1 mode, but each point still shows up clearly, unlike Line0 mode if adjacent samples have widely different values. This is the slowest line style for Daqarta to draw because it may have to put a lot of points on the screen, so you should avoid this if display update speed is an issue.