Description:
For a given chromaticity (defined by xy coordinates), there is a maximum
relative luminosity that is physically attainable.  The relative luminosity
is the percentage of light that an object colour reflects, measured with
respect to the photopic luminous efficiency curve for
the CIE standard observer.  A colour attaining
this maximum is called an optimal colour.  Optimal colours depend on the
illuminant chosen.  This file lists optimal colours for illuminant D65.  
The data in this file are taken from Table II(3.7), on pp. 778-779 of
[Wyszecki1982].
Two colours have been added, because they are helpful in calculations.
These are theoretical black, given by xyY = (0,0,0), and pure white, given by
xyY = (0.3127, 0.3290, 100).  (0.3127, 0.3290) is the chromaticity of
illuminant D65.  Theoretical black (an object colour of zero reflectance) 
does not attain maximum luminosity, but it is optimal in the sense that it
is on the boundary of the Rosch colour solid.  If converted to XYZ coordinates,
it is also on the boundary of the CIE XYZ colour solid.

[Wyszecki1982] Gunter Wyszecki & W. S. Stiles. Color Science: Concepts 
     and Methods, Quantitative Data and Formulae, 2nd ed., John Wiley 
     and Sons, 1982.

DESCRIPTION ENDS HERE
  x        y     Y
0.0000	0.0000	0
0.1346	0.0747	10
0.0990	0.1607	10
0.0751	0.2403	10
0.0391	0.4074	10
0.0211	0.5490	10
0.0177	0.6693	10
0.0344	0.7732	10
0.0516	0.8055	10
0.0727	0.8223	10
0.0959	0.8261	10
0.1188	0.8213	10
0.7035	0.2965	10
0.6832	0.2853	10
0.6470	0.2653	10
0.5517	0.2132	10
0.5309	0.2019	10
0.4346	0.1504	10
0.3999	0.1324	10
0.3549	0.1101	10
0.3207	0.0945	10
0.2989	0.0857	10
0.2852	0.0808	10
0.2660	0.0755	10
0.2186	0.0707	10
0.1268	0.1365	20
0.1081	0.1984	20
0.0894	0.2766	20
0.0660	0.4074	20
0.0549	0.4971	20
0.0479	0.6227	20
0.0565	0.7312	20
0.0927	0.8005	20
0.1289	0.8078	20
0.1479	0.8026	20
0.1664	0.7941	20
0.6708	0.3289	20
0.6591	0.3213	20
0.5988	0.2820	20
0.5514	0.2513	20
0.5018	0.2197	20
0.4502	0.1874	20
0.4045	0.1601	20
0.3762	0.1443	20
0.3440	0.1284	20
0.3185	0.1196	20
0.2935	0.1164	20
0.2528	0.1189	20
0.2205	0.1229	20
0.1282	0.1889	30
0.1067	0.3003	30
0.0990	0.3535	30
0.0929	0.4041	30
0.0846	0.5028	30
0.0819	0.6020	30
0.0836	0.6491	30
0.1004	0.7433	30
0.1481	0.7857	30
0.1799	0.7787	30
0.2119	0.7609	30
0.6368	0.3628	30
0.6281	0.3561	30
0.5682	0.3098	30
0.5271	0.2784	30
0.4977	0.2562	30
0.4504	0.2212	30
0.4219	0.2008	30
0.3999	0.1859	30
0.3801	0.1732	30
0.3491	0.1574	30
0.3350	0.1536	30
0.3197	0.1526	30
0.2021	0.1732	30
0.1360	0.2324	40
0.1266	0.3030	40
0.1219	0.3504	40
0.1183	0.3985	40
0.1155	0.4509	40
0.1141	0.5055	40
0.1312	0.7047	40
0.1516	0.7454	40
0.1853	0.7587	40
0.2129	0.7510	40
0.2415	0.7344	40
0.6041	0.3954	40
0.5969	0.3888	40
0.5524	0.3484	40
0.5257	0.3244	40
0.4980	0.2997	40
0.4598	0.2661	40
0.3696	0.1949	40
0.3603	0.1898	40
0.3501	0.1859	40
0.3375	0.1841	40
0.2581	0.2001	40
0.2220	0.2095	40
0.1771	0.2214	40
0.1491	0.2679	50
0.1441	0.3511	50
0.1429	0.4025	50
0.1429	0.4479	50
0.1472	0.5522	50
0.1548	0.6201	50
0.1621	0.6570	50
0.1790	0.7035	50
0.1929	0.7201	50
0.2114	0.7277	50
0.2991	0.6851	50
0.5731	0.4262	50
0.5668	0.4195	50
0.5492	0.4009	50
0.4795	0.3281	50
0.4514	0.2994	50
0.4113	0.2600	50
0.3897	0.2401	50
0.3509	0.2139	50
0.3391	0.2126	50
0.3211	0.2155	50
0.3042	0.2200	50
0.2466	0.2374	50
0.2041	0.2507	50
0.1674	0.2959	60
0.1677	0.3520	60
0.1700	0.4130	60
0.1749	0.4782	60
0.1801	0.5257	60
0.1873	0.5730	60
0.1994	0.6257	60
0.2088	0.6523	60
0.2506	0.6927	60
0.3703	0.6900	60
0.2930	0.6798	60
0.5435	0.4552	60
0.5379	0.4483	60
0.4775	0.3751	60
0.4522	0.3450	60
0.4138	0.3005	60
0.3611	0.2472	60
0.3497	0.2405	60
0.3395	0.2388	60
0.3195	0.2429	60
0.2963	0.2505	60
0.2701	0.2595	60
0.2270	0.2747	60
0.2037	0.2830	60
0.1916	0.3164	70
0.1958	0.3656	70
0.2003	0.4069	70
0.2065	0.4485	70
0.2150	0.4963	70
0.2221	0.5295	70
0.2298	0.5597	70
0.2402	0.5918	70
0.2550	0.6237	70
0.2784	0.6484	70
0.3000	0.6521	70
0.5148	0.4825	70
0.5097	0.4753	70
0.4776	0.4304	70
0.4508	0.3933	70
0.4192	0.3505	70
0.4005	0.3259	70
0.3706	0.2890	70
0.3663	0.2842	70
0.3517	0.2699	70
0.3364	0.2634	70
0.3194	0.2671	70
0.3007	0.2739	70
0.2664	0.2872	70
0.2232	0.3290	80
0.2404	0.4145	80
0.2496	0.4504	80
0.2583	0.4801	80
0.2760	0.5308	80
0.3023	0.5809	80
0.3092	0.5892	80
0.3318	0.6041	80
0.3515	0.6048	80
0.3679	0.5995	80
0.4080	0.5750	80
0.4858	0.5081	80
0.4811	0.5005	80
0.4634	0.4719	80
0.4514	0.4526	80
0.4299	0.4158	80
0.4001	0.3720	80
0.3732	0.3319	80
0.3603	0.3139	80
0.3500	0.3009	80
0.3307	0.2866	80
0.2730	0.3080	80
0.2519	0.3169	80
0.2400	0.3219	80
0.2639	0.3331	90
0.2801	0.3832	90
0.2864	0.4008	90
0.3059	0.4486	90
0.3182	0.4746	90
0.3317	0.4994	90
0.3513	0.5278	90
0.3657	0.5421	90
0.3946	0.5537	90
0.4126	0.5510	90
0.4354	0.5406	90
0.4530	0.5293	90
0.4486	0.5210	90
0.4444	0.5131	90
0.4325	0.4906	90
0.4215	0.4700	90
0.3990	0.4284	90
0.3749	0.3849	90
0.3504	0.3431	90
0.3349	0.3196	90
0.3217	0.3084	90
0.3099	0.3124	90
0.2852	0.3235	90
0.2711	0.3299	90
0.2875	0.3320	95
0.2949	0.3513	95
0.3067	0.3800	95
0.3230	0.4150	95
0.3368	0.4415	95
0.3508	0.4654	95
0.3644	0.4856	95
0.3765	0.5007	95
0.3887	0.5126	95
0.4003	0.5206	95
0.4108	0.5251	95
0.4281	0.5268	95
0.4204	0.5109	95
0.4132	0.4959	95
0.4031	0.4751	95
0.3697	0.4076	95
0.3498	0.3692	95
0.3401	0.3513	95
0.3295	0.3331	95
0.3167	0.3189	95
0.3148	0.3195	95
0.3103	0.3214	95
0.3006	0.3259	95
0.2900	0.3308	95
0.3127	0.3290	100