% !Mode:: "TeX:UTF-8" \documentclass[tikz]{standalone} \usepackage{fontspec} \usepackage{unicode-math} \usepackage{pgfplots} \setmainfont{Libertinus Serif} \setmathfont{Libertinus Math} \pgfplotsset{compat=1.16} \begin{document} 	\begin{tikzpicture} [ 		] 		\pgfdeclarehorizontalshading{rainbow}{100bp}{ 			color(0bp)=(violet); 			color(30.5bp)=(violet); 			color(41bp)=(blue); 			color(47bp)=(cyan); 			color(51bp)=(green); 			color(56.5bp)=(yellow); 			color(61bp)=(orange); 			color(75bp)=(red); 			color(100bp)=(red) 		} 		\begin{axis} [ 			width=14cm, 			height=8cm, 			xlabel={Wavelength (nm)}, 			ylabel={Normalized absorbance}, 			xtick={400,450,...,700}, 			minor x tick num=4, 			ytick={0,50,100}, 			minor y tick num=4, 			xmajorgrids=true, 			ymajorgrids=true, 			yminorgrids=true, 			xmin=370,xmax=700, 			ymin=0,ymax=100, 			legend pos=north east, 			clip=false, 			every axis plot/.append style={no markers,smooth,tension=0.9,line width=2pt} 		] 			\addplot+ [blue] table [x=x,y=Blue] { x	Blue 369.69	59.877 379.76	68.998 389.81	77.812 400.00	88.804 409.79	97.001 419.32	100 429.68	96.916 440.17	88.166 450.08	71.953 460.17	51.388 470.09	37.355 480.69	26.279 490.20	18.317 499.87	13.465 510.31	9.236 520.39	5.319 530.73	2.648 			}; 			\addlegendentry{Blue cones}; 			\node at (axis cs:420,100) [above,text=blue] {420 nm};  			\addplot+ [black,dashed] table [x=x,y=Rods] { x	Rods 400.07	32.817 410.12	34.014 419.41	36.614 430.06	40.927 440.38	49.285 449.94	60.445 460.13	72.227 469.85	83.701 480.03	92.533 490.05	98.411 499.53	100 509.52	96.641 519.99	87.124 530.57	73.566 541.38	58.608 550.87	41.942 559.83	28.856 569.69	19.966 580.21	13.411 590.79	7.946 601.08	4.192 			}; 			\addlegendentry{Rods}; 			\node at (axis cs:498,100) [above,text=black] {498 nm};  			\addplot+ [green] table [x=x,y=Green] { x	Green 400.20	35.771 410.24	35.413 419.53	34.903 430.37	34.238 440.40	35.443 450.14	38.049 460.18	42.367 469.90	50.264 480.27	57.695 490.29	68.239 499.57	78.473 509.74	88.242 519.77	95.834 529.84	99.851 540.62	99.045 550.06	93.888 559.47	83.133 568.89	69.112 580.09	53.847 590.42	40.917 600.73	29.231 610.49	20.657 620.26	14.105 630.11	8.954 640.26	5.98 649.49	3.474 			}; 			\addlegendentry{Green cones}; 			\node at (axis cs:534,100) [above,text=green] {534 nm};  			\addplot+ [red] table [x=x,y=Red] { x	Red 400.19	37.171 410.24	35.257 419.53	32.881 430.23	30.04 440.41	28.756 450.15	27.785 460.36	30.391 469.76	34.09 480.49	40.432 490.69	48.02 499.61	56.389 510.20	64.601 520.24	74.837 530.55	83.986 540.63	92.047 550.28	97.154 559.66	99.774 569.28	99.282 579.98	94.594 590.57	85.862 599.77	75.112 610.10	62.027 619.59	47.699 630.65	34.458 639.58	26.199 649.44	17.315 660.71	10.455 668.78	7.016 679.21	3.734 			}; 			\addlegendentry{Red cones}; 			\node at (axis cs:564,100) [above,text=red] {564 nm}; 			 			\shade [shading=rainbow] (370,-30) rectangle (700,-20); 			\begin{scope}[font=\small\bfseries,text=white,text height=1.5ex,text depth=0.25ex] 				\node at (400,-25) {Violet}; 				\node at (470,-25) {Blue}; 				\node at (515,-25) {Cyan}; 				\node at (545,-25) {Green}; 				\node at (575,-25) {Yellow}; 				\node at (620,-25) {Orange}; 				\node at (680,-25) {Red}; 			\end{scope} 		\end{axis} 	\end{tikzpicture} \end{document}