*squaric acid; Colmenero et al.; refrective index; theroretical data* data provided by F. Colmenero; for details see paper.
nm		n		k
200.23334316	1.47587612	0.02924602
200.92747268	1.46132128	0.03247917
201.62643148	1.44746673	0.03576213
202.33027014	1.43405919	0.03917586
203.03903995	1.42125015	0.04319718
203.75275941	1.40949784	0.04765669
204.47154800	1.39892380	0.05156357
205.19542597	1.38899409	0.05402399
205.92444754	1.37894220	0.05507809
206.65866774	1.36835389	0.05539283
207.39814237	1.35714863	0.05534803
208.14292805	1.34519033	0.05505466
208.89308219	1.33244939	0.05524825
209.64866305	1.31966174	0.05714116
210.40972973	1.30830220	0.06079177
211.17634219	1.29940573	0.06413470
211.94856127	1.29239413	0.06417624
212.72644871	1.28517667	0.05911911
213.51006714	1.27531377	0.04940863
214.29948013	1.26120446	0.03730521
215.09475219	1.24263890	0.02562088
215.89594880	1.22058230	0.01634466
216.70313640	1.19641449	0.00998191
217.51638245	1.17118635	0.00595465
218.33575541	1.14535756	0.00345569
219.16132478	1.11899505	0.00197767
219.99312209	1.09206301	0.00127374
220.83129674	1.06450230	0.00107468
221.67588271	1.03613273	0.00101773
222.52695385	1.00660256	0.00084989
223.38458514	0.97549697	0.00057509
224.24885272	0.94246492	0.00035545
225.11983392	0.90722605	0.00031690
225.99760728	0.86948273	0.00046752
226.88225255	0.82880788	0.00070463
227.77385075	0.78454750	0.00088395
228.67248417	0.73574716	0.00093782
229.57823642	0.68109242	0.00094040
230.49119241	0.61873110	0.00108125
231.41143844	0.54577991	0.00164627
232.33906216	0.45700713	0.00308529
233.27415266	0.33998735	0.00627670
234.21680046	0.13395572	0.02100321
235.16709755	0.01101363	0.29390866
236.12513740	0.00795987	0.44385173
237.09101504	0.00734386	0.56176146
238.06482705	0.00808750	0.66534758
239.04662550	0.00953787	0.76091391
240.03660199	0.01091862	0.85203064
241.03481227	0.01189051	0.94150751
242.04135947	0.01305825	1.03172308
243.05634850	0.01591746	1.12448849
244.07988599	0.02284494	1.22079560
245.11208040	0.03720476	1.32019400
246.15304201	0.06156697	1.42044517
247.20288302	0.09438705	1.51921260
248.26171751	0.13128166	1.61698141
249.32966155	0.17311566	1.71665868
250.40683321	0.22925632	1.81808731
251.49335260	0.30647407	1.91453555
252.58934193	0.39794566	1.99756545
253.69492554	0.48976644	2.06435950
254.81022999	0.57497208	2.11839677
255.93538404	0.65391993	2.16361047
257.07051874	0.72390463	2.20126371
258.21576749	0.77633123	2.23412112
259.37126606	0.80193718	2.27220977
260.53715268	0.80246790	2.33527723
261.71351282	0.80929998	2.44354138
262.90059973	0.87338367	2.59319880
264.09850455	1.01708999	2.75121574
265.30737583	1.21877135	2.88262807
266.52736485	1.44631384	2.97081684
267.75862570	1.67973359	3.01375977
269.00131531	1.90196789	3.01265312
270.25559355	2.09354396	2.97301687
271.52162329	2.24971232	2.91297022
272.79957045	2.38917309	2.85469439
274.08960410	2.53193915	2.80271723
275.39189652	2.67741861	2.74381002
276.70662329	2.81777185	2.67113819
278.03396334	2.96014714	2.59072308
279.37409907	3.11343587	2.49664834
280.72721638	3.25845899	2.36115861
282.09350484	3.35532478	2.16827267
283.47315769	3.38257265	1.94665989
284.86637198	3.35696461	1.75288175
286.27334865	3.31500010	1.62031745
287.69429263	3.28365029	1.53897083
289.12934553	3.27434035	1.48567787
290.57885473	3.29300689	1.44327591
292.04297097	3.33548178	1.38727276
293.52191618	3.37770278	1.28909389
295.01591679	3.38843568	1.14513772
296.52520387	3.35241061	0.98725421
298.05001324	3.27732944	0.85822330
299.59058560	3.18492565	0.78334435
301.14716664	3.10137737	0.76663002
302.72000720	3.05304904	0.79708120
304.30936338	3.05601475	0.84284410
305.91549668	3.09800614	0.85639420
307.53867416	3.14286771	0.81035021
309.17916858	3.16156992	0.72253676
310.83725853	3.15229110	0.63512139
312.51322864	3.13118447	0.57026854
314.20736970	3.10875994	0.51635782
315.91997882	3.08233027	0.46160579
317.65135964	3.05214998	0.41720558
319.40182251	3.02893412	0.39024338
321.17168462	3.01705546	0.36030213
322.96118614	3.00445238	0.30872981
324.77082593	2.97900356	0.24681004
326.60085979	2.94175410	0.19387412
328.45163445	2.89875799	0.15099622
330.32350451	2.85043026	0.11244408
332.21683272	2.79572752	0.08465453
334.13199017	2.74109867	0.07911973
336.06935658	2.69882260	0.09478633
338.02932052	2.67635127	0.11539106
340.01227967	2.66944019	0.12258020
342.01864111	2.66619362	0.10918056
344.04882158	2.65614729	0.08143355
346.10324777	2.63570356	0.05145173
348.18235663	2.60750937	0.02814467
350.28659566	2.57645729	0.01368119
352.41642326	2.54624697	0.00596937
354.57230904	2.51849801	0.00228390
356.75473418	2.49349364	0.00073211
358.96419175	2.47097370	0.00018818
361.20118715	2.45051974	0.00003734
363.46623843	2.43172799	0.00000576
365.75976883	2.41428105	0.00000062
368.08253740	2.39795183	0.00000000
370.43499615	2.38257906	0.00000000
372.81771800	2.36804307	0.00000000
375.23129070	2.35425105	0.00000000
377.67631733	2.34112793	0.00000000
380.15341679	2.32861160	0.00000000
382.66322432	2.31665038	0.00000000
385.20639205	2.30519869	0.00000000
387.78358958	2.29421817	0.00000000
390.39550451	2.28367445	0.00000000
393.04284312	2.27353733	0.00000000
395.72633098	2.26378002	0.00000000
398.44671360	2.25437841	0.00000000
401.20475713	2.24531067	0.00000000
404.00124909	2.23655718	0.00000000
406.83699911	2.22810009	0.00000000
409.71283971	2.21992297	0.00000000
412.62962711	2.21201085	0.00000000
415.58824209	2.20435002	0.00000000
418.58959090	2.19692763	0.00000000
421.63446272	2.18973218	0.00000000
424.72410217	2.18275239	0.00000000
427.85935620	2.17597840	0.00000000
431.04124247	2.16940084	0.00000000
434.27080916	2.16301086	0.00000000
437.54913610	2.15679994	0.00000000
440.87733596	2.15076103	0.00000000
444.25655553	2.14488671	0.00000000
447.68797705	2.13916993	0.00000000
451.17281954	2.13360470	0.00000000
454.71234028	2.12818491	0.00000000
458.30783634	2.12290485	0.00000000
461.96064612	2.11775919	0.00000000
465.67215103	2.11274324	0.00000000
469.44377726	2.10785199	0.00000000
473.27699754	2.10308107	0.00000000
477.17333313	2.09842632	0.00000000
481.13435580	2.09388347	0.00000000
485.16168993	2.08944873	0.00000000
489.25701477	2.08511870	0.00000000
493.42206672	2.08088947	0.00000000
497.65864184	2.07675829	0.00000000
501.96839517	2.07272188	0.00000000
506.35365282	2.06877718	0.00000000
510.81620604	2.06492106	0.00000000
515.35811663	2.06115113	0.00000000
519.98152041	2.05746495	0.00000000
524.68863051	2.05385978	0.00000000
529.48174095	2.05033339	0.00000000
534.36323032	2.04688348	0.00000000
539.33556578	2.04350777	0.00000000
544.40130714	2.04020440	0.00000000
549.56311134	2.03697104	0.00000000
554.82373702	2.03380628	0.00000000
560.18604947	2.03070800	0.00000000
565.65302585	2.02767428	0.00000000
571.22776067	2.02470368	0.00000000
576.91347164	2.02179475	0.00000000
582.71350589	2.01894552	0.00000000
588.63134650	2.01615476	0.00000000
594.67061950	2.01342097	0.00000000
600.83510126	2.01074290	0.00000000
607.12872641	2.00811902	0.00000000
613.55529251	2.00554805	0.00000000
620.11967703	2.00302896	0.00000000
626.82604438	2.00056042	0.00000000
633.67905140	1.99814139	0.00000000
640.68356083	1.99577053	0.00000000
647.84465282	1.99344701	0.00000000
655.16763722	1.99116976	0.00000000
662.65806670	1.98893766	0.00000000
670.32175079	1.98675011	0.00000000
678.16477094	1.98460575	0.00000000
686.19349657	1.98250397	0.00000000
694.41460235	1.98044389	0.00000000
702.83508668	1.97842437	0.00000000
711.46229162	1.97644504	0.00000000
720.30392415	1.97450500	0.00000000
729.36807922	1.97260336	0.00000000
738.66326442	1.97073946	0.00000000
748.19842662	1.96891264	0.00000000
757.98298071	1.96712201	0.00000000