2025-09-17 REL PDBj INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY STRUCTURE_SUMMARY chem_comp chem_comp_atom chem_comp_bond database_2 em_admin entity pdbx_entity_nonpoly pdbx_entry_details pdbx_modification_feature pdbx_struct_conn_angle pdbx_validate_chiral struct_conn struct_conn_type _chem_comp.formula _chem_comp.name _database_2.pdbx_DOI _database_2.pdbx_database_accession _em_admin.last_update _entity.pdbx_description _pdbx_entity_nonpoly.name _pdbx_entry_details.has_protein_modification _pdbx_struct_conn_angle.ptnr1_auth_asym_id _pdbx_struct_conn_angle.ptnr1_auth_comp_id _pdbx_struct_conn_angle.ptnr1_auth_seq_id _pdbx_struct_conn_angle.ptnr1_label_asym_id _pdbx_struct_conn_angle.ptnr1_label_atom_id _pdbx_struct_conn_angle.ptnr1_label_comp_id _pdbx_struct_conn_angle.ptnr1_label_seq_id _pdbx_struct_conn_angle.ptnr2_auth_asym_id _pdbx_struct_conn_angle.ptnr2_auth_comp_id _pdbx_struct_conn_angle.ptnr2_auth_seq_id _pdbx_struct_conn_angle.ptnr2_label_asym_id _pdbx_struct_conn_angle.ptnr2_label_atom_id _pdbx_struct_conn_angle.ptnr2_label_comp_id _pdbx_struct_conn_angle.ptnr3_auth_asym_id _pdbx_struct_conn_angle.ptnr3_auth_comp_id _pdbx_struct_conn_angle.ptnr3_auth_seq_id _pdbx_struct_conn_angle.ptnr3_label_asym_id _pdbx_struct_conn_angle.ptnr3_label_atom_id _pdbx_struct_conn_angle.ptnr3_label_comp_id _pdbx_struct_conn_angle.ptnr3_label_seq_id _pdbx_struct_conn_angle.value _struct_conn.conn_type_id _struct_conn.id _struct_conn.pdbx_dist_value _struct_conn.pdbx_leaving_atom_flag _struct_conn.ptnr1_auth_asym_id _struct_conn.ptnr1_auth_comp_id _struct_conn.ptnr1_auth_seq_id _struct_conn.ptnr1_label_asym_id _struct_conn.ptnr1_label_atom_id _struct_conn.ptnr1_label_comp_id _struct_conn.ptnr1_label_seq_id _struct_conn.ptnr2_auth_asym_id _struct_conn.ptnr2_auth_comp_id _struct_conn.ptnr2_auth_seq_id _struct_conn.ptnr2_label_asym_id _struct_conn.ptnr2_label_atom_id _struct_conn.ptnr2_label_comp_id _struct_conn.ptnr2_label_seq_id _struct_conn_type.id STRUCTURE_SUMMARY database_2 em_admin entity _chem_comp.name _database_2.pdbx_DOI _database_2.pdbx_database_accession _em_admin.last_update _entity.pdbx_description STRUCTURE_SUMMARY em_admin pdbx_modification_feature pdbx_validate_close_contact struct_conn _em_admin.last_update EXPERIMENTAL_SUMMARY em_admin _em_admin.last_update PDBj PDBj 2019-10-21 2020-05-20 2020-05-20 2025-09-17 Nagao R Kato K Photosystem I, ELECTRON TRANSPORT Nagao R Kato K Ifuku K Suzuki T Kumazawa M Uchiyama I Kashino Y Dohmae N Akimoto S Shen JR Miyazaki N Akita F Nat Commun UK 2020 doi:10.1038/s41467-020-16324-3 2041-1723 6l4u FULLOVERLAP PDB 6L4T unspecified

6L4T contains the subset of fcp in the PSI-FCPI supercomplex.

EMDB EMD-0835 associated EM volume

Structure of the PSI-FCPI supercomplex from diatom

PSI-FCPI PSI-FCPI 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Chaetoceros gracilis 0.64 Photosystem I P700 chlorophyll a apoprotein A1 Chaetoceros gracilis 0.08364867200000001 1 LEVO AISSTERRTKNVQIFVEKDAVETSFEKWAQPGHFSRTLAKGPKTTTWIWNLHADAHDFDSQTNSLEEVSRKIFSAHFGQL AAIFLWISGMHFHGAYFSNYSAWLSDPIGIKQSSQVVWPIVGQEILNADVGGNFQGVQTTSGWFQMWRAEGITSEVELYW IAIGGLIMSALMLFAGWFHYHKAAPKLEWFQNAESMMNHHLAGLLGLGCLSWSGHQIHIALPINKLLDAGVSPQEIPLPH EFLINRELMAQLYPSFGKGLAPFFSGHWGEYSDFLTFKGGLNPVTGGLWLSDIAHHHLALSVLFIVAGHMYRTNWGIGHS MKEILEAHKGPFTGEGHKGLYEILTTSWHAQLAINLAMMGSLSIIVAHHMYAMPPYPYIATDYATQLSLFTHHMWIGGFC VTGGAAHAAIFMVRDYTPANNYNNLLDRVLRHRDAIISHLNWVCIFLGCHAFGFYIHNDTMRALGRPQDMFSDKAIQLQP IFAQWIQNIHLLAPGTTAPNALATTSYAFGGDVVEVGGKIAMMPIKLGTADFMVHHIHAFTIHVTVLILLKGVLYARSSK LIPDKANLGFRFPCDGPGRGGTCQSSSWDHVFLGLFWMYNSISVVIFHFSWKMQSDVWGTVTPDGSISHITGGNFAQSSI TINGWLRDFLWSQASQVIQSYGSASSAYGLIFLGAHFIWAFSLMFLFSGRGYWQELIESIVWAHNKLNFAPAIQPRALSI TQGRAVGLAHYLLGGIGTTWAFFLARSLSIT Photosystem I P700 chlorophyll a apoprotein A2 Chaetoceros gracilis 0.081897477 1 LEVO MATKFPKFSQALAQDPATRRIWYGIATAHDLEAHDGMTEENLYQKIFASHFGHLAIIFLWTAGNLFHVAWQGNFEQWVAK PLKTKPIAHSIWDPHFGESALKAFSKGNTYPVNIAFSGVYQWWYTIGFRTNQELYAGSIGLLALSCVLLFAGWLHLQPKF RPSLSWFKNNESRLNHHLSGLLGVSSLAWTGHIVHVAIPASRGVHVGWDNFLTTPPHPAGLTPFFTGNWTVYAENPDSAS HVYGTSEGAGTAILTFLGGFHPQTQSLWLSDIAHHQLAIAVVFIIAGHMYRTNFGIGHNMKEILDAHRPPGGRLGAGHVG LFETITNSLHMQLGLALASLGVATSLTAQHMYALTPYAYLSKDFTTEAALYTHHQYIAGFLMVGAFAHGAIFFVRDYDPE LNKNNVLARMLEHKEAIISHLSWASLFLGFHTLGLYIHNDTVVAFGQPEKQILFEPVFAEYIQAASGKAVYQFNVLLSSP TSPATVAGNQVWLPGWLDAINNPKNDLFLKIGPGDFLVHHAIALGLHVTALILVKGALDARGSKLMPDKKDFGYSFPCDG PGRGGTCDISAWDAFYLAMFWMLNTIGWVTFYWHWKHMTIWGGNPGQFDESSNYIMGWLRDYLWLNSSPLINGYNPFGMN NLSVWSWMFLFGHLIWATGFMFLISWRGYWQELIETLVWAHERTPLANLIRWRDKPVALSIVQARLVGLAHFSVGYILTY AAFVIASTSGKFG Photosystem I iron-sulfur center Chaetoceros gracilis 0.008807169 1 LEVO MSHTVKIYDTCIGCTQCVRACPTDVLEMVPWDGCKSGQIASSPRVEDCVGCKRCETACPTDFLSVRVYLGAETTRSLGLA Y Photosystem I reaction center subunit II Chaetoceros gracilis 0.015594646 1 LEVO MTLNLQTPFPTFGGSTGGWLRSAEVEEKYAITWTSKKEQIFEMPTGGAAIMRNGENLLYLARKEQCLALGTQLRTFKIND YKIYRIFPSGEVQYLHPKDGVFPEKVNPGRTSVNSRDFSIGKNPNPASIKFSGTTTYES Photosystem I reaction center subunit IV Chaetoceros gracilis 0.007621466999999999 1 LEVO MVGRGSKVRILRKESYWFNQVGTVATIDQSGIRYPALVRFESVNYAGTNSNNFALDELKEVVEETEE Photosystem I reaction center subunit III Chaetoceros gracilis 0.020445615 1 LEVO MKRFNILTLLVAVLITLTPNIASAEIGGLTKCSDSPAFAKREKASIKKLEQRKSTYEAGTPPALALQQQIERTEARFDKY SRSELLCGADGLPHLIADGRWSHAAEFMLPGFGFIYISGWIGWVGRKYLRAVSTTKNPAESEIIINVPLALKIMTTGYIW PISAWEELVSGDLVALDEEVTVSPR Photosystem I reaction center subunit VIII Chaetoceros gracilis 0.0039447399999999995 1 LEVO MAAAFLPSILVPIVGLIFPAFSMALFFLYIQQDDIA Photosystem I reaction center subunit IX Chaetoceros gracilis 0.004882823999999999 1 LEVO MKNFQKYLSTAPVLLTIWMTFTAGFIIEINRFFPDMLGLYF Photosystem I reaction center subunit XI Chaetoceros gracilis 0.016148812 1 LEVO MANFIKPYNDDPFVGHLATPITSSAVTRALLKNLPAYRFGLTPLLRGLEIGLAHGYFLIGPFVKLGPLRNSDIALIAGFL STIGLILILTLGLTIYGAAVFNSDKESLETTETTLQTRKAWDQFKGGFFVGACGSAGFALICLSSIPQSIL Photosystem I reaction center subunit XII Chaetoceros gracilis 0.0032418629999999998 1 LEVO MIYDSQVYIALVIAVVASVLAIRLGATLYN Unknown protein 1 Chaetoceros gracilis 0.011081651 1 LEVO (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK) Photosystem I reaction center subunit Psa28 Chaetoceros gracilis 0.012899798 1 LEVO FAPMPRAAISTTQARTASMPSAPFTSLSMASEDMTWEGEYPPSKVLGPIMSKMPSGLLGLISIACAAVCAYSIAQSGVLQ QQPGAYENGSWVKWYYVLGSFGGPLAWGTHVASWIQRKNGM Fucoxanthin chlorophyll a/c-binding protein Lhcr15 Chaetoceros gracilis 0.024881913999999998 1 LEVO MILQYFNTFPPPKRSYKKVYNIIIHYFIIMVRSVLLAALVGTAAAFAPATSMTRRSPAVALKAEMSESLPFLPRPEKLDG SMAGDRGFDPMGLSEIQQDLTYARWAELKHGRIAMLAIVGMIVQEYIHLPGEAYQNSDPFGAVSTVGLGVNGQIFAAIGC VELINFNKHYDGSEPGDIGWTGGLLKNKSEAEIMKAKEQEITHCRLAMIAITGATVQTLLFHQPLLG Fucoxanthin chlorophyll a/c-binding protein Lhcr8 Chaetoceros gracilis 0.021727958999999998 1 LEVO MKLALLASLIASAAAFAPSSSTGARASTALDAGKQSQALPFLPYPENLSGYVGDAGFDPLRFSDYFPMDYLREAEIKHGR ICMLATVGWIAVDMGLRVYPVPAGLEGVTAATAHDASVAQGGLGQVFGWVAVAEMASWIGVSQMLQGSGREPGYFGFDPL GLMKGKSEAEVNNMKLKEIKNGRLAMLAFSGICTQSVLFDKTFPF Fucoxanthin chlorophyll a/c-binding protein Lhcr2 Chaetoceros gracilis 0.021558555 1 LEVO MKTVAILSLLTASAAAFAPASTTQTSSSTALAGSVFDNYVGAKDFRGAEFKFDPLKLSETYEPFQGWFRESELRHGRTAM LAVVGYIATDFVRIPGEMYSFEAIPKSADAHDALIASGPMSQLLLWIGLFDLVVTAPAVQAMGKGEREPGDFGLKWFAPS SKDAFDKKREAELLNGRLAMFAIGGIATQSVLNGHGFPYL Fucoxanthin chlorophyll a/c-binding protein Lhcr9 Chaetoceros gracilis 0.022933426 1 LEVO MAKLSIALTTAAALASSANAFAPSKGARSVTSALSATGFEEVGGKPWDPLSLGKLEDANDTFPNMFPKSQYLQESEIKHG RMCMLAWTGVWATHVGGMGLGMHIPGMPVESDWTKALGVFAAEQPALFGAILLFISIAEGESVGHSGDNWRNMSTKEPGN LGFDWMGLTKKLSEEKVARYKIVELKNGRAAMIAMASLFAMEAIPGSVPIMNVFN Fucoxanthin chlorophyll a/c-binding protein Lhcr11 Chaetoceros gracilis 0.029512190999999997 1 LEVO MVVCHLILSRITNFLPLSLAHYRTCTSPTPTTPPKKTVVSSALHAEMSKAVPFVKAPANTAGYVGDVGFDPLGFSDYFDM KWLRESEIKHGRASMLACLGFVVQEYITIPGYTHVDDSNLAPQAVGVSAMLQIVLWMGVLEFWTNKGNVTMETMFSSPDR IPGNLGFDPMGLSVGKSQAEKDEMALKEIKNGRLAMLAIGGMIHHNWRKRHGALTSRERERNVLQTLDAFLKVHMHTVLC VSCSIWDVNSIFIMRDGIESSFGFPD Fucoxanthin chlorophyll a/c-binding protein Lhcr12 Chaetoceros gracilis 0.022362646 1 LEVO MKLALLASLIASAAAFAPSSSTGAARASTALDAGKKSQALPFLPYPENLAGYVGDAGFDPFRFSDFAPMDFLREAEIKHG RICMLAWLGFVAVDLGARIYPLPEAYEGLTAVTAHDALVQQGAMSQIFLWCSVFEAISTVSVIQMLYEESGREPGYFGFD PLGFLNGKSEAEVNEMKLKEIKNGRLAMLAFSGVVTQAVLTQGPFPYV Fucoxanthin chlorophyll a/c-binding protein Lhcr10 Chaetoceros gracilis 0.032238152 1 LEVO LLQGFSRWLVFFVSIRIIRHPCRPPYHETYSSSNTFLSIQYIEQSHSARQTSLSLLLITPLTLVLYLAIYTILKMFKTAA AITSLLAASASAFAPSSFNGRISTAVAAEKSQSLPFMNRPPLLDGSMAGDVGFDPLGLSNIDDVGIDLYWLREAEIKHCR VAMLAVVGILQVEIFGPAPGCEMATDKCQMDAFWQIWGAHPQYIAFGLIMIMMIEMISGIATTQGRESGERAPGDFGLDP LGYGKGDAAGYARLQAQEIANGRLAMFAAAGEIMQGCTTHQGALENLMTALRDNSF Fucoxanthin chlorophyll a/c-binding protein Lhcr4 Chaetoceros gracilis 0.02970415 1 LEVO LRSIHHLIASHRRLFKFIRHYTINKMKSALIATALLAGSAAAFTSNAGSQSTSALKAMPERLWDSMVDKTERSKAVPFLP RAVNLDGSLPGDVGFDPFYLSSIPKDFSGFIQPPQWEEKGIPTLYWMREAELKHCRVAMLAWFGWLATDGAFGVTLRFPG EIYSVENIPTAYEAHNALVSQGSMGFLLLAVGFIEFCTGAVLVEVAKGASDREAGDFKLDPLSFLKGKSEEEIKRMKTRE IANGRLAMLAFGGVATQTALEGGNHAFPYF Fucoxanthin chlorophyll a/c-binding protein Lhcf6 Chaetoceros gracilis 0.023517385 1 LEVO LLLPYSPYLKSSLTHFDISSHSQPPLFSTNPHSSAFAPSSQTNVRSTSSLQAWKDENIIGITAPMGFFDPLGLSSGKSDE VMNLYREAELKHGRVAMAACLGWYITAAGVHPAFNSALSSDPLEAAKQLPTVGWLQFVLGCGAIEWLAQQIKARPGYQPG DILGAAYWVDNSDEGWVDYQNKEINNGRLAMVAFMGIFVQDLYFGNYGDQIFRN Fucoxanthin chlorophyll a/c-binding protein Lhcr3 Chaetoceros gracilis 0.022216549 1 LEVO MKSVAILAALFGSATAFVPSQVSRTAASTSVKASLADMVGAEGPEPIPFAPSKTSKNFDPVGFAERSPEWLPWYREAELK HGRAAMLATVGFVVPEFIRVPGEQFSFEAIPKVIDAHDALPESMIQIFGWISFLEACTFPAMAGLGGKYDRKPGDFSFDP LGLYPTDPEKQKQMQLAELKNGRLAMIAIGGMVTGAAVTGHGFPYLP Fucoxanthin chlorophyll a/c-binding protein Lhcq13 Chaetoceros gracilis 0.024842496 1 LEVO MKTAAIFALLAGSAAAFAPTTVSPRASTVAHMSSINEAFGISIETGNKCPPLGARILEDAQPSAIKWFQNAEIKHGRIAM VATIGYLVQKLGVHFPLYLGPSGSNCFHPESETAWLLSSSTGVTFSDIAKAAPLDAIQMVPVAGWMQIFFVAGWFESVAY YRQWVKNSPIPGDYGYDPLGFTKREGGWDSEELTSLRLKEIKNGRLAMMTIAAWVSDEMIPGALPVWHP Fucoxanthin chlorophyll a/c-binding protein Lhcq3 Chaetoceros gracilis 0.021318404 1 LEVO MKSVLFLALAGSAAAFAPSTQSRSNTLLKADLSSLPGSTAPVGPFDPLNLADSGSEETLAWFRASELKHGRVAMLATTGY LVQGAGIHFPGMLSSDVSFESLSAMKPLEAWDAVPDAGKAQILGTIFIAEMITESKPVHYTKGGPMPTMVFPAIDFSGVD AATLKRKQDSELNNGRLAMIAIMSFISAANIPGSVPALTNNPAF Fucoxanthin chlorophyll a/c-binding protein Lhcq11 Chaetoceros gracilis 0.025994562 1 LEVO MKLAILTTLLAGASAFTTPNARPAFATKLSMSEEAAAEEAPAADAPEEVVEPASPSYTCISKEAILSSPDTTEIGRVWDP LGLAEIGSAETLAWYRHSEVKHGRIAMAAFVGWWAVGAGLRFPGELSHGLEFSSIPSKGLEAWDAVPGWGKAQMLLFAGL IEFHDELFHTRRTEGGHYLRGGTPGKNMVPGLFDPFGFSKGKSEEELAKGRDREIKNGRLAMIGVAGLYCAATIPGSVPL QPPC Fucoxanthin chlorophyll a/c-binding protein Lhcq10 Chaetoceros gracilis 0.026875780999999998 1 LEVO MKIILSGLALLASSVAAFAPQSIISANANNKNANVVLEAAKDDLIAIAEKSNPVLKYYDPLQLGSTTIWGETNSATIGFL RQSEIKHGRIAMAAFVGYIVQANGIHFPWPMSFDGTPFPADAGSPPEQWDALSDAAKWQIILFIGFLEWFSEAAGKHYMR GGKPGAFPNFSDSDLIPHPVPLNLYDPFGFSKGKTEAQKADGLIKELNNGRLAMIGIMGFLAEQKVEGSVPLLKGVVPHY DGEVMAPFM Fucoxanthin chlorophyll a/c-binding protein Lhcq8 Chaetoceros gracilis 0.030545674 1 LEVO MDNKIAGYNIIIHTIISSINMKFSLVVLSSLVVASSNGVTAFAPSSSTTSTSTTALSSSASKAELEAIAKKANPTLGYYD PLSLADKDFWGKGNDATIAFLRQSEIKHGRIAMFAFVGYIVQSNFVFPWAQTLAGAPHPSADLSPEAQWDAIPLGAKWQI FAVISALELWDECGGGGVLPHYTKGRKPGQYPPFTLFRDNVHFVLDLYDPFGFNKNMSEETKERRLVSELNNGRLAMLGI FGFLCADTIPGSVPLLNDIAIPYSGQVMQPFEGQFSYFGSL Fucoxanthin chlorophyll a/c-binding protein Lhcq5 Chaetoceros gracilis 0.023533191 1 LEVO MKIATLFLALASSAAAFAPSQQVRSMTNEKMKPRQARNNFALNMKVDEMPGATAPLGKFDPLNLATLGSESTLAWFRAAE LKHSRVAMLATTGYLVQAAGIHFPGMLSSDVSFESLSAMKPLDAWDAVPEGGKNQIYFTIFLAEFITECKGTHYTKGGPL PTIVFPPIDFSTVNPEQLKTRQNRELNNGRLAMIAIMSFVAAANIPGSVPALAGNPMF CHLOROPHYLL A ISOMER 0.000893489 1 CL0 CHLOROPHYLL A 0.000893489 221 CLA PHYLLOQUINONE 0.000450696 2 PQN IRON/SULFUR CLUSTER 0.00035163999999999996 3 SF4 BETA-CAROTENE 0.000536873 20 BCR 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE 0.00072297 7 LHG DODECYL-BETA-D-MALTOSIDE 0.000510615 21 LMT 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE 0.0007871579999999999 13 LMG (3S,3'S,5R,5'R,6S,6'R,8'R)-3,5'-dihydroxy-8-oxo-6',7'-didehydro-5,5',6,6',7,8-hexahydro-5,6-epoxy-beta,beta-caroten-3'- yl acetate 0.0006589059999999999 54 A86 Chlorophyll c1 0.000610941 54 KC1 (3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,beta-carotene-3,3'-diol 0.000582855 31 DD6 water 1.8015e-05 156 HOH singleParticle particle 2 6.5 20.0 MES-NaOH MES-NaOH 0.02 DDM DDM Quantifoil R1.2/1.3 MOLYBDENUM 300 CARBON HOLEY ARRAY PLASMA CLEANING 30 ETHANE 100 277 FEI VITROBOT MARK IV FEI TITAN KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 FEI FALCON III (4k x 4k) COUNTING 50.0 1 2689965 CTFFIND 4 PHASE FLIPPING AND AMPLITUDE CORRECTION EMD-9853 C1 FOURIER SPACE 2.4 FSC 0.143 CUT-OFF RELION 3 470801 MAXIMUM LIKELIHOOD RELION 3 MAXIMUM LIKELIHOOD RELION 3 6 RELION 3 FLEXIBLE FIT Correlation coefficient REAL