Use the bottom line on the chart to mark the wavelengths of the visible colors. Since the wavelengths range from $400$ to $700$ nm choose any scale you wish. Remember to label your chart so it is clear to the person reading it$.$
 

1 Chart #1 1x1014 2x1014 3x10 14- 4x10 14- 5x10 14- 6x1014- 7x10 14- 8x10 14- 9x10 14- 10x1014- 11x1014- 12x1014 13x10 14- 14x10 14- 15x10 14- 16x1014- 101 102 103 104 105 106 107 108 109 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 17x1014 18x10 14- 19x10 14- 20x1014 14- 21x1014- 22x1014 23x10 14- 24x10 14- 25x1014