1 | ;+ |
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2 | ; @file_comments |
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3 | ; |
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4 | ; @categories |
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5 | ; |
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6 | ; @param SN |
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7 | ; |
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8 | ; @param TN |
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9 | ; |
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10 | ; @keyword INSITU |
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11 | ; |
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12 | ; @keyword SIGMA_N |
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13 | ; |
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14 | ; @returns |
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15 | ; |
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16 | ; @uses |
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17 | ; |
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18 | ; @restrictions |
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19 | ; |
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20 | ; @examples |
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21 | ; |
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22 | ; @history |
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23 | ; |
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24 | ; @version |
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25 | ; $Id$ |
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26 | ; |
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27 | ;; |
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28 | ;; Calcul de la fonction d'etat (issue de eos.F) |
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29 | ;; |
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30 | ;; Creation : 1997 / G. Roullet |
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31 | ;; adaptation pour les tableaux z,zt,xyz,xyzt |
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32 | ;; par seb. |
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33 | ;; |
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34 | ; @todo seb |
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35 | ; |
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36 | ;- |
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37 | ; |
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38 | FUNCTION rhon, sn, tn, INSITU = insitu, SIGMA_N = sigma_n |
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39 | ; |
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40 | compile_opt idl2, strictarrsubs |
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41 | ; |
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42 | @common |
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43 | tempsun = systime(1) ; pour key_performance |
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44 | sn = -1e5 > double(sn) < 1e5 |
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45 | tn = -1e5 > double(tn) < 1e5 |
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46 | |
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47 | |
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48 | IF keyword_set(sigma_n) then insitu = 1 |
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49 | |
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50 | taille = size(sn) |
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51 | case taille[0] of |
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52 | 0:BEGIN ;z |
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53 | zrhop=0d |
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54 | jkmax = 1 |
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55 | END |
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56 | 1:BEGIN ;z |
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57 | zrhop=dblarr(taille[1]) |
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58 | jkmax = taille[1] |
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59 | END |
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60 | 2:BEGIN ;xy (jpt=1) ou zt |
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61 | zrhop=dblarr(taille[1],taille[2]) |
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62 | if jpt EQ 1 then jkmax = 1 ELSE jkmax = taille[1] |
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63 | END |
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64 | 3:BEGIN ;xyz (jpt=1) ou xyt |
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65 | zrhop=dblarr(taille[1],taille[2],taille[3]) |
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66 | if jpt EQ 1 then jkmax = taille[3] ELSE jkmax = 1 |
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67 | END |
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68 | 4:BEGIN ;xyzt |
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69 | zrhop=dblarr(taille[1],taille[2],taille[3],taille[4] ) |
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70 | jkmax = taille[3] |
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71 | END |
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72 | endcase |
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73 | |
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74 | |
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75 | |
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76 | FOR jk = 0, jkmax-1 DO BEGIN |
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77 | |
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78 | case taille[0] of |
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79 | 0:BEGIN ;z |
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80 | ztt = tn |
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81 | zs = sn |
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82 | END |
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83 | 1:BEGIN ;z |
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84 | ztt = tn[jk] |
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85 | zs = sn[jk] |
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86 | END |
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87 | 2:BEGIN ;xy (jpt=1) ou zt |
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88 | if jpt EQ 1 then begin |
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89 | ztt = tn |
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90 | zs = sn |
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91 | ENDIF ELSE BEGIN |
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92 | ztt = tn[jk, *] |
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93 | zs = sn[jk, *] |
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94 | ENDELSE |
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95 | END |
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96 | 3:BEGIN ;xyz (jpt=1) ou xyt |
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97 | if jpt EQ 1 then begin |
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98 | ztt = tn[*, *, jk] |
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99 | zs = sn[*, *,jk] |
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100 | endif ELSE BEGIN |
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101 | ztt = tn |
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102 | zs = sn |
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103 | ENDELSE |
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104 | END |
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105 | 4:BEGIN ;xyzt |
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106 | ztt = tn[*, *, jk, *] |
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107 | zs = sn[*, *,jk, *] |
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108 | END |
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109 | endcase |
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110 | if n_elements(sigma_n) NE 0 then zh = 1000.*sigma_n ELSE zh = gdept[jk] |
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111 | ; ... square root salinity |
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112 | zsr= sqrt(abs(zs)) |
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113 | ; ... compute density pure water at atm pressure |
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114 | zr1=((((6.536332e-9*ztt-1.120083e-6)*ztt+1.001685e-4)*ztt-9.095290e-3)*ztt+6.793952e-2)*ztt+999.842594 |
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115 | ; ... seawater density atm pressure |
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116 | zr2= (((5.3875e-9*ztt-8.2467e-7)*ztt+7.6438e-5)*ztt-4.0899e-3)*ztt+0.824493 |
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117 | zr3= (-1.6546e-6*ztt+1.0227e-4)*ztt-5.72466e-3 |
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118 | zr4= 4.8314e-4 |
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119 | ; |
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120 | ; ... potential density (reference to the surface) |
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121 | case taille[0] of |
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122 | 0: zrhop = (zr4*zs + zr3*zsr + zr2)*zs + zr1 |
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123 | 1: zrhop[jk]= (zr4*zs + zr3*zsr + zr2)*zs + zr1 |
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124 | 2:BEGIN |
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125 | if jpt EQ 1 then zrhop = (zr4*zs + zr3*zsr + zr2)*zs + zr1 $ |
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126 | ELSE zrhop[jk, *]= (zr4*zs + zr3*zsr + zr2)*zs + zr1 |
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127 | END |
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128 | 3:BEGIN |
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129 | if jpt EQ 1 then zrhop[*, *,jk]= (zr4*zs + zr3*zsr + zr2)*zs + zr1 $ |
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130 | ELSE zrhop = (zr4*zs + zr3*zsr + zr2)*zs + zr1 |
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131 | END |
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132 | 4: zrhop[*, *,jk, *]= (zr4*zs + zr3*zsr + zr2)*zs + zr1 |
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133 | endcase |
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134 | |
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135 | IF n_elements(insitu) EQ 1 THEN BEGIN |
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136 | ; ... add the compression terms |
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137 | ze = (-3.508914e-8*ztt-1.248266e-8)*ztt-2.595994e-6 |
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138 | zbw= ( 1.296821e-6*ztt-5.782165e-9)*ztt+1.045941e-4 |
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139 | zb = zbw + ze * zs |
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140 | ; |
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141 | zd = -2.042967e-2 |
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142 | zc = (-7.267926e-5*ztt+2.598241e-3)*ztt+0.1571896 |
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143 | zaw = ((5.939910e-6*ztt+2.512549e-3)*ztt-0.1028859)*ztt -4.721788 |
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144 | za = ( zd*zsr + zc)*zs + zaw |
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145 | ; |
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146 | zb1= (-0.1909078*ztt+7.390729)*ztt-55.87545 |
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147 | za1= ((2.326469e-3*ztt+1.553190)*ztt-65.00517)*ztt+1044.077 |
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148 | zkw= (((-1.361629e-4*ztt-1.852732e-2)*ztt-30.41638)*ztt+2098.925)*ztt+190925.6 |
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149 | zk0= (zb1*zsr + za1)*zs + zkw |
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150 | ; |
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151 | ; ... masked in situ density |
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152 | case taille[0] of |
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153 | 0: zrhop = zrhop / (1.0-zh/(zk0-zh*(za-zh*zb))) |
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154 | 1: zrhop[jk] = zrhop[jk] / (1.0-zh/(zk0-zh*(za-zh*zb))) |
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155 | 2:BEGIN |
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156 | if jpt EQ 1 then zrhop = zrhop / (1.0-zh/(zk0-zh*(za-zh*zb))) $ |
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157 | ELSE zrhop[jk, *] = zrhop[jk, *] / (1.0-zh/(zk0-zh*(za-zh*zb))) |
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158 | END |
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159 | 3:BEGIN |
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160 | if jpt EQ 1 then zrhop[*, *,jk] = zrhop[*, *,jk] / (1.0-zh/(zk0-zh*(za-zh*zb))) $ |
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161 | ELSE zrhop = zrhop / (1.0-zh/(zk0-zh*(za-zh*zb))) |
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162 | END |
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163 | 4: zrhop[*, *,jk, *] = zrhop[*, *,jk, *] / (1.0-zh/(zk0-zh*(za-zh*zb))) |
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164 | endcase |
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165 | |
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166 | ENDIF |
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167 | ENDFOR |
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168 | |
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169 | terre = where(tn GE 1e6) |
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170 | if terre[0] NE -1 then zrhop[terre] = valmask |
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171 | |
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172 | if keyword_set(key_performance) THEN print, 'temps rhon', systime(1)-tempsun |
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173 | |
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174 | |
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175 | return, zrhop |
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176 | END |
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