def ccalc_viridis(x, rgbmax):
	"""viridis colour map"""
	r = [0.26700401, 0.26851048, 0.26994384, 0.27130489, 0.27259384, 0.27380934, 0.27495242, 0.27602238, 0.2770184, 0.27794143, 0.27879067, 0.2795655, 0.28026658, 0.28089358, 0.28144581, 0.28192358, 0.28232739, 0.28265633, 0.28291049, 0.28309095, 0.28319704, 0.28322882, 0.28318684, 0.283072, 0.28288389, 0.28262297, 0.28229037, 0.28188676, 0.28141228, 0.28086773, 0.28025468, 0.27957399, 0.27882618, 0.27801236, 0.27713437, 0.27619376, 0.27519116, 0.27412802, 0.27300596, 0.27182812, 0.27059473, 0.26930756, 0.26796846, 0.26657984, 0.2651445, 0.2636632, 0.26213801, 0.26057103, 0.25896451, 0.25732244, 0.25564519, 0.25393498, 0.25219404, 0.25042462, 0.24862899, 0.2468114, 0.24497208, 0.24311324, 0.24123708, 0.23934575, 0.23744138, 0.23552606, 0.23360277, 0.2316735, 0.22973926, 0.22780192, 0.2258633, 0.22392515, 0.22198915, 0.22005691, 0.21812995, 0.21620971, 0.21429757, 0.21239477, 0.2105031, 0.20862342, 0.20675628, 0.20490257, 0.20306309, 0.20123854, 0.1994295, 0.1976365, 0.19585993, 0.19410009, 0.19235719, 0.19063135, 0.18892259, 0.18723083, 0.18555593, 0.18389763, 0.18225561, 0.18062949, 0.17901879, 0.17742298, 0.17584148, 0.17427363, 0.17271876, 0.17117615, 0.16964573, 0.16812641, 0.1666171, 0.16511703, 0.16362543, 0.16214155, 0.16066467, 0.15919413, 0.15772933, 0.15626973, 0.15481488, 0.15336445, 0.1519182, 0.15047605, 0.14903918, 0.14760731, 0.14618026, 0.14475863, 0.14334327, 0.14193527, 0.14053599, 0.13914708, 0.13777048, 0.1364085, 0.13506561, 0.13374299, 0.13244401, 0.13117249, 0.1299327, 0.12872938, 0.12756771, 0.12645338, 0.12539383, 0.12439474, 0.12346281, 0.12260562, 0.12183122, 0.12114807, 0.12056501, 0.12009154, 0.11973756, 0.11951163, 0.11942341, 0.11948255, 0.11969858, 0.12008079, 0.12063824, 0.12137972, 0.12231244, 0.12344358, 0.12477953, 0.12632581, 0.12808703, 0.13006688, 0.13226797, 0.13469183, 0.13733921, 0.14020991, 0.14330291, 0.1466164, 0.15014782, 0.15389405, 0.15785146, 0.16201598, 0.1663832, 0.1709484, 0.17570671, 0.18065314, 0.18578266, 0.19109018, 0.19657063, 0.20221902, 0.20803045, 0.21400015, 0.22012381, 0.2263969, 0.23281498, 0.2393739, 0.24606968, 0.25289851, 0.25985676, 0.26694127, 0.27414922, 0.28147681, 0.28892102, 0.29647899, 0.30414796, 0.31192534, 0.3198086, 0.3277958, 0.33588539, 0.34407411, 0.35235985, 0.36074053, 0.3692142, 0.37777892, 0.38643282, 0.39517408, 0.40400101, 0.4129135, 0.42190813, 0.43098317, 0.44013691, 0.44936763, 0.45867362, 0.46805314, 0.47750446, 0.4870258, 0.49661536, 0.5062713, 0.51599182, 0.52577622, 0.5356211, 0.5455244, 0.55548397, 0.5654976, 0.57556297, 0.58567772, 0.59583934, 0.60604528, 0.61629283, 0.62657923, 0.63690157, 0.64725685, 0.65764197, 0.66805369, 0.67848868, 0.68894351, 0.69941463, 0.70989842, 0.72039115, 0.73088902, 0.74138803, 0.75188414, 0.76237342, 0.77285183, 0.78331535, 0.79375994, 0.80418159, 0.81457634, 0.82494028, 0.83526959, 0.84556056, 0.8558096, 0.86601325, 0.87616824, 0.88627146, 0.89632002, 0.90631121, 0.91624212, 0.92610579, 0.93590444, 0.94563626, 0.95529972, 0.96489353, 0.97441665, 0.98386829, 0.99324789]
	g = [0.00487433, 0.00960483, 0.01462494, 0.01994186, 0.02556309, 0.03149748, 0.03775181, 0.04416723, 0.05034437, 0.05632444, 0.06214536, 0.06783587, 0.07341724, 0.07890703, 0.0843197, 0.08966622, 0.09495545, 0.10019576, 0.10539345, 0.11055307, 0.11567966, 0.12077701, 0.12584799, 0.13089477, 0.13592005, 0.14092556, 0.14591233, 0.15088147, 0.15583425, 0.16077132, 0.16569272, 0.17059884, 0.1754902, 0.18036684, 0.18522836, 0.19007447, 0.1949054, 0.19972086, 0.20452049, 0.20930306, 0.21406899, 0.21881782, 0.22354911, 0.2282621, 0.23295593, 0.23763078, 0.24228619, 0.2469217, 0.25153685, 0.2561304, 0.26070284, 0.26525384, 0.26978306, 0.27429024, 0.27877509, 0.28323662, 0.28767547, 0.29209154, 0.29648471, 0.30085494, 0.30520222, 0.30952657, 0.31382773, 0.3181058, 0.32236127, 0.32659432, 0.33080515, 0.334994, 0.33916114, 0.34330688, 0.34743154, 0.35153548, 0.35561907, 0.35968273, 0.36372671, 0.36775151, 0.37175775, 0.37574589, 0.37971644, 0.38366989, 0.38760678, 0.39152762, 0.39543297, 0.39932336, 0.40319934, 0.40706148, 0.41091033, 0.41474645, 0.4185704, 0.42238275, 0.42618405, 0.42997486, 0.43375572, 0.4375272, 0.44128981, 0.4450441, 0.4487906, 0.4525298, 0.45626209, 0.45998802, 0.46370813, 0.4674229, 0.47113278, 0.47483821, 0.47853961, 0.4822374, 0.48593197, 0.4896237, 0.49331293, 0.49700003, 0.50068529, 0.50436904, 0.50805136, 0.51173263, 0.51541316, 0.51909319, 0.52277292, 0.52645254, 0.53013219, 0.53381201, 0.53749213, 0.54117264, 0.54485335, 0.54853458, 0.55221637, 0.55589872, 0.55958162, 0.56326503, 0.56694891, 0.57063316, 0.57431754, 0.57800205, 0.58168661, 0.58537105, 0.58905521, 0.59273889, 0.59642187, 0.60010387, 0.60378459, 0.60746388, 0.61114146, 0.61481702, 0.61849025, 0.62216081, 0.62582833, 0.62949242, 0.63315277, 0.63680899, 0.64046069, 0.64410744, 0.64774881, 0.65138436, 0.65501363, 0.65863619, 0.66225157, 0.66585927, 0.66945881, 0.67304968, 0.67663139, 0.68020343, 0.68376525, 0.68731632, 0.69085611, 0.69438405, 0.6978996, 0.70140222, 0.70489133, 0.70836635, 0.71182668, 0.71527175, 0.71870095, 0.72211371, 0.72550945, 0.72888753, 0.73224735, 0.73558828, 0.73890972, 0.74221104, 0.74549162, 0.74875084, 0.75198807, 0.75520266, 0.75839399, 0.76156142, 0.76470433, 0.76782207, 0.77091403, 0.77397953, 0.7770179, 0.78002855, 0.78301086, 0.78596419, 0.78888793, 0.79178146, 0.79464415, 0.79747541, 0.80027461, 0.80304099, 0.80577412, 0.80847343, 0.81113836, 0.81376835, 0.81636288, 0.81892143, 0.82144351, 0.82392862, 0.82637633, 0.82878621, 0.83115784, 0.83349064, 0.83578452, 0.83803918, 0.84025437, 0.8424299, 0.84456561, 0.84666139, 0.84871722, 0.8507331, 0.85270912, 0.85464543, 0.85654226, 0.85839991, 0.86021878, 0.86199932, 0.86374211, 0.86544779, 0.86711711, 0.86875092, 0.87035015, 0.87191584, 0.87344918, 0.87495143, 0.87642392, 0.87786808, 0.87928545, 0.88067763, 0.88204632, 0.88339329, 0.88472036, 0.88602943, 0.88732243, 0.88860134, 0.88986815, 0.89112487, 0.89237353, 0.89361614, 0.89485467, 0.89609127, 0.89732977, 0.8985704, 0.899815, 0.90106534, 0.90232311, 0.90358991, 0.90486726, 0.90615657]
	b = [0.32941519, 0.33542652, 0.34137895, 0.34726862, 0.35309303, 0.35885256, 0.36454323, 0.37016418, 0.37571452, 0.38119074, 0.38659204, 0.39191723, 0.39716349, 0.40232944, 0.40741404, 0.41241521, 0.41733086, 0.42216032, 0.42690202, 0.43155375, 0.43611482, 0.44058404, 0.44496, 0.44924127, 0.45342734, 0.45751726, 0.46150995, 0.46540474, 0.46920128, 0.47289909, 0.47649762, 0.47999675, 0.48339654, 0.48669702, 0.48989831, 0.49300074, 0.49600488, 0.49891131, 0.50172076, 0.50443413, 0.50705243, 0.50957678, 0.5120084, 0.5143487, 0.5165993, 0.51876163, 0.52083736, 0.52282822, 0.52473609, 0.52656332, 0.52831152, 0.52998273, 0.53157905, 0.53310261, 0.53455561, 0.53594093, 0.53726018, 0.53851561, 0.53970946, 0.54084398, 0.5419214, 0.54294396, 0.54391424, 0.54483444, 0.54570633, 0.546532, 0.54731353, 0.54805291, 0.54875211, 0.54941304, 0.55003755, 0.55062743, 0.5511844, 0.55171011, 0.55220646, 0.55267486, 0.55311653, 0.55353282, 0.55392505, 0.55429441, 0.55464205, 0.55496905, 0.55527637, 0.55556494, 0.55583559, 0.55608907, 0.55632606, 0.55654717, 0.55675292, 0.55694377, 0.5571201, 0.55728221, 0.55743035, 0.55756466, 0.55768526, 0.55779216, 0.55788532, 0.55796464, 0.55803034, 0.55808199, 0.55811913, 0.55814141, 0.55814842, 0.55813967, 0.55811466, 0.5580728, 0.55801347, 0.557936, 0.55783967, 0.55772371, 0.55758733, 0.55742968, 0.5572505, 0.55704861, 0.55682271, 0.55657181, 0.55629491, 0.55599097, 0.55565893, 0.55529773, 0.55490625, 0.55448339, 0.55402906, 0.55354108, 0.55301828, 0.55245948, 0.55186354, 0.55122927, 0.55055551, 0.5498411, 0.54908564, 0.5482874, 0.54744498, 0.54655722, 0.54562298, 0.54464114, 0.54361058, 0.54253043, 0.54139999, 0.54021751, 0.53898192, 0.53769219, 0.53634733, 0.53494633, 0.53348834, 0.53197275, 0.53039808, 0.52876343, 0.52706792, 0.52531069, 0.52349092, 0.52160791, 0.51966086, 0.5176488, 0.51557101, 0.5134268, 0.51121549, 0.50893644, 0.5065889, 0.50417217, 0.50168574, 0.49912906, 0.49650163, 0.49380294, 0.49103252, 0.48818938, 0.48527326, 0.48228395, 0.47922108, 0.47608431, 0.4728733, 0.46958774, 0.46622638, 0.46278934, 0.45927675, 0.45568838, 0.45202405, 0.44828355, 0.44446673, 0.44057284, 0.4366009, 0.43255207, 0.42842626, 0.42422341, 0.41994346, 0.41558638, 0.41115215, 0.40664011, 0.40204917, 0.39738103, 0.39263579, 0.38781353, 0.38291438, 0.3779385, 0.37288606, 0.36775726, 0.36255223, 0.35726893, 0.35191009, 0.34647607, 0.3409673, 0.33538426, 0.32972749, 0.32399761, 0.31819529, 0.31232133, 0.30637661, 0.30036211, 0.29427888, 0.2881265, 0.28190832, 0.27562602, 0.26928147, 0.26287683, 0.25641457, 0.24989748, 0.24332878, 0.23671214, 0.23005179, 0.22335258, 0.21662012, 0.20986086, 0.20308229, 0.19629307, 0.18950326, 0.18272455, 0.17597055, 0.16925712, 0.16260273, 0.15602894, 0.14956101, 0.14322828, 0.13706449, 0.13110864, 0.12540538, 0.12000532, 0.11496505, 0.11034678, 0.10621724, 0.1026459, 0.09970219, 0.09745186, 0.09595277, 0.09525046, 0.09537439, 0.09633538, 0.09812496, 0.1007168, 0.10407067, 0.10813094, 0.11283773, 0.11812832, 0.12394051, 0.13021494, 0.13689671, 0.1439362]
	i = int(round(x * 255, 0))
	return [r[i]*rgbmax, g[i]*rgbmax, b[i]*rgbmax]