[3] | 1 | MODULE zdfmxl |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfmxl *** |
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| 4 | !! Ocean physics: mixed layer depth |
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| 5 | !!====================================================================== |
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[1559] | 6 | !! History : 1.0 ! 2003-08 (G. Madec) original code |
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[1585] | 7 | !! 3.2 ! 2009-07 (S. Masson, G. Madec) IOM + merge of DO-loop |
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[4990] | 8 | !! 3.7 ! 2012-03 (G. Madec) make public the density criteria for trdmxl |
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| 9 | !! - ! 2014-02 (F. Roquet) mixed layer depth calculated using N2 instead of rhop |
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[3] | 10 | !!---------------------------------------------------------------------- |
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[1585] | 11 | !! zdf_mxl : Compute the turbocline and mixed layer depths. |
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[3] | 12 | !!---------------------------------------------------------------------- |
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[8215] | 13 | USE oce ! ocean dynamics and tracers variables |
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| 14 | USE dom_oce ! ocean space and time domain variables |
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| 15 | USE trc_oce , ONLY: l_offline ! ocean space and time domain variables |
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| 16 | USE zdf_oce ! ocean vertical physics |
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| 17 | USE in_out_manager ! I/O manager |
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| 18 | USE prtctl ! Print control |
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| 19 | USE phycst ! physical constants |
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| 20 | USE iom ! I/O library |
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| 21 | USE lib_mpp ! MPP library |
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| 22 | USE timing ! Timing |
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[3] | 23 | |
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| 24 | IMPLICIT NONE |
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| 25 | PRIVATE |
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| 26 | |
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[8215] | 27 | PUBLIC zdf_mxl ! called by zdfphy.F90 |
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[3] | 28 | |
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[8215] | 29 | INTEGER , PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: nmln !: number of level in the mixed layer (used by LDF, ZDF, TRD, TOP) |
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| 30 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld !: mixing layer depth (turbocline) [m] (used by TOP) |
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| 31 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] (used by LDF) |
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| 32 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: depth of the last T-point inside the mixed layer [m] (used by LDF) |
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[3] | 33 | |
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[4990] | 34 | REAL(wp), PUBLIC :: rho_c = 0.01_wp !: density criterion for mixed layer depth |
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| 35 | REAL(wp) :: avt_c = 5.e-4_wp ! Kz criterion for the turbocline depth |
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| 36 | |
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[3] | 37 | !!---------------------------------------------------------------------- |
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[8215] | 38 | !! NEMO/OPA 4.0 , NEMO Consortium (2017) |
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[1152] | 39 | !! $Id$ |
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[2715] | 40 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 41 | !!---------------------------------------------------------------------- |
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| 42 | CONTAINS |
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| 43 | |
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[2715] | 44 | INTEGER FUNCTION zdf_mxl_alloc() |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | !! *** FUNCTION zdf_mxl_alloc *** |
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| 47 | !!---------------------------------------------------------------------- |
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[2787] | 48 | zdf_mxl_alloc = 0 ! set to zero if no array to be allocated |
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[2758] | 49 | IF( .NOT. ALLOCATED( nmln ) ) THEN |
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| 50 | ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), STAT= zdf_mxl_alloc ) |
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| 51 | ! |
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| 52 | IF( lk_mpp ) CALL mpp_sum ( zdf_mxl_alloc ) |
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| 53 | IF( zdf_mxl_alloc /= 0 ) CALL ctl_warn('zdf_mxl_alloc: failed to allocate arrays.') |
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| 54 | ! |
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| 55 | ENDIF |
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[2715] | 56 | END FUNCTION zdf_mxl_alloc |
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| 57 | |
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| 58 | |
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[3] | 59 | SUBROUTINE zdf_mxl( kt ) |
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| 60 | !!---------------------------------------------------------------------- |
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| 61 | !! *** ROUTINE zdfmxl *** |
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| 62 | !! |
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[1585] | 63 | !! ** Purpose : Compute the turbocline depth and the mixed layer depth |
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| 64 | !! with density criteria. |
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[3] | 65 | !! |
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[1577] | 66 | !! ** Method : The mixed layer depth is the shallowest W depth with |
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| 67 | !! the density of the corresponding T point (just bellow) bellow a |
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[4245] | 68 | !! given value defined locally as rho(10m) + rho_c |
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[1585] | 69 | !! The turbocline depth is the depth at which the vertical |
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| 70 | !! eddy diffusivity coefficient (resulting from the vertical physics |
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| 71 | !! alone, not the isopycnal part, see trazdf.F) fall below a given |
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[4990] | 72 | !! value defined locally (avt_c here taken equal to 5 cm/s2 by default) |
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[3] | 73 | !! |
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[1585] | 74 | !! ** Action : nmln, hmld, hmlp, hmlpt |
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[1559] | 75 | !!---------------------------------------------------------------------- |
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[2715] | 76 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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[4990] | 77 | ! |
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[6352] | 78 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 79 | INTEGER :: iikn, iiki, ikt ! local integer |
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| 80 | REAL(wp) :: zN2_c ! local scalar |
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[8215] | 81 | INTEGER, DIMENSION(jpi,jpj) :: imld ! 2D workspace |
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[3] | 82 | !!---------------------------------------------------------------------- |
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[3294] | 83 | ! |
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| 84 | IF( nn_timing == 1 ) CALL timing_start('zdf_mxl') |
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| 85 | ! |
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[3] | 86 | IF( kt == nit000 ) THEN |
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| 87 | IF(lwp) WRITE(numout,*) |
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| 88 | IF(lwp) WRITE(numout,*) 'zdf_mxl : mixed layer depth' |
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| 89 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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[2715] | 90 | ! ! allocate zdfmxl arrays |
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| 91 | IF( zdf_mxl_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_mxl : unable to allocate arrays' ) |
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[3] | 92 | ENDIF |
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| 93 | |
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[1559] | 94 | ! w-level of the mixing and mixed layers |
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[7753] | 95 | nmln(:,:) = nlb10 ! Initialization to the number of w ocean point |
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| 96 | hmlp(:,:) = 0._wp ! here hmlp used as a dummy variable, integrating vertically N^2 |
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| 97 | zN2_c = grav * rho_c * r1_rau0 ! convert density criteria into N^2 criteria |
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[4990] | 98 | DO jk = nlb10, jpkm1 |
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| 99 | DO jj = 1, jpj ! Mixed layer level: w-level |
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| 100 | DO ji = 1, jpi |
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| 101 | ikt = mbkt(ji,jj) |
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[6140] | 102 | hmlp(ji,jj) = hmlp(ji,jj) + MAX( rn2b(ji,jj,jk) , 0._wp ) * e3w_n(ji,jj,jk) |
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[4990] | 103 | IF( hmlp(ji,jj) < zN2_c ) nmln(ji,jj) = MIN( jk , ikt ) + 1 ! Mixed layer level |
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| 104 | END DO |
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| 105 | END DO |
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| 106 | END DO |
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| 107 | ! |
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[6140] | 108 | ! w-level of the turbocline and mixing layer (iom_use) |
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[7753] | 109 | imld(:,:) = mbkt(:,:) + 1 ! Initialization to the number of w ocean point |
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[4990] | 110 | DO jk = jpkm1, nlb10, -1 ! from the bottom to nlb10 |
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[3] | 111 | DO jj = 1, jpj |
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| 112 | DO ji = 1, jpi |
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[6140] | 113 | IF( avt (ji,jj,jk) < avt_c * wmask(ji,jj,jk) ) imld(ji,jj) = jk ! Turbocline |
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[3] | 114 | END DO |
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| 115 | END DO |
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| 116 | END DO |
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[1559] | 117 | ! depth of the mixing and mixed layers |
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[3] | 118 | DO jj = 1, jpj |
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| 119 | DO ji = 1, jpi |
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[1585] | 120 | iiki = imld(ji,jj) |
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[1577] | 121 | iikn = nmln(ji,jj) |
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[6140] | 122 | hmld (ji,jj) = gdepw_n(ji,jj,iiki ) * ssmask(ji,jj) ! Turbocline depth |
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| 123 | hmlp (ji,jj) = gdepw_n(ji,jj,iikn ) * ssmask(ji,jj) ! Mixed layer depth |
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| 124 | hmlpt(ji,jj) = gdept_n(ji,jj,iikn-1) * ssmask(ji,jj) ! depth of the last T-point inside the mixed layer |
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[3] | 125 | END DO |
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| 126 | END DO |
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[7646] | 127 | ! |
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| 128 | IF( .NOT.l_offline ) THEN |
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| 129 | IF( iom_use("mldr10_1") ) THEN |
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| 130 | IF( ln_isfcav ) THEN ; CALL iom_put( "mldr10_1", hmlp - risfdep) ! mixed layer thickness |
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| 131 | ELSE ; CALL iom_put( "mldr10_1", hmlp ) ! mixed layer depth |
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[6352] | 132 | END IF |
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[6140] | 133 | END IF |
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[7646] | 134 | IF( iom_use("mldkz5") ) THEN |
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| 135 | IF( ln_isfcav ) THEN ; CALL iom_put( "mldkz5" , hmld - risfdep ) ! turbocline thickness |
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| 136 | ELSE ; CALL iom_put( "mldkz5" , hmld ) ! turbocline depth |
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[6352] | 137 | END IF |
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[7646] | 138 | ENDIF |
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[2758] | 139 | ENDIF |
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[1482] | 140 | |
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[1577] | 141 | IF(ln_ctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ', ovlap=1 ) |
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[1559] | 142 | ! |
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[3294] | 143 | IF( nn_timing == 1 ) CALL timing_stop('zdf_mxl') |
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| 144 | ! |
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[3] | 145 | END SUBROUTINE zdf_mxl |
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| 146 | |
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| 147 | !!====================================================================== |
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| 148 | END MODULE zdfmxl |
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