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The line width on a printed chart appears to vary from the screen line width due to the difference in the resolution of a printed page versus the monitor. The reason why it does this is that the screen is approx. 72 dpi. When you make a line that is five pixels wide, it looks like a swath of color. The printer is (typically) 600 dpi. When you make a line that is five pixels wide, it is still five times as wide as the other plot, but it doesn't look like the screen. We prefer to print plot data as finely as possible with the printer resolution so that we are portraying the data as accurately as we can.
Marcus Monroe Application Engineer National Instruments
