These charts have an overall size of 12.5" x 10". Used to measure low and intermediate frequency response (streaking) and flare in video systems. Chart consists of a solid white (R = 3%) background with 90% reflective rectangle with width equal to 25% of picture width (approx. 0.05 MHz.) Also on chart is narrow black pulse width equal to 1% W (approx. 1.25 MHz.) Similar to equivalent electronically generated patterns.