The image must be printed to scale: Measurement from the bottom edge of the 3'0" line to the bottom edge of the 6'0" line must be 91.5 cm +/- 1 cm. (Between 90.5 and 92.5 cm). • The lines must be straight: The Measurement from the bottom edge of the 3'0" line must not bend more than 0.3cm off true (straight) over the length of the line when laid flat.