1 | c **************************************************************
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2 | c
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3 | c This file contains the subroutines: enyflx
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4 | c
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5 | c Copyright 2003 Frank Eisenmenger, U.H.E. Hansmann,
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6 | c Shura Hayryan, Chin-Ku
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7 | c Copyright 2007 Frank Eisenmenger, U.H.E. Hansmann,
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8 | c Jan H. Meinke, Sandipan Mohanty
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9 | c
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10 | c **************************************************************
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11 |
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12 |
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13 | real*8 function enyflx(nml)
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14 |
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15 | c .......................................................................
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16 | c
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17 | c PURPOSE: Calculate internal energy of molecule 'nml' with FLEX dataset
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18 | c
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19 | c CALLS: none
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20 | c
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21 | c .......................................................................
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22 |
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23 | include 'INCL.H'
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24 |
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25 | ntlvr=nvrml(nml)
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26 | if (ntlvr.eq.0) then
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27 | write (*,'(a,i4)')
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28 | # ' enyflx> No variables defined in molecule #',nml
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29 | return
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30 | endif
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31 |
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32 | enyflx=0.0
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33 | eyel=0.0
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34 | eyvw=0.0
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35 | eyhb=0.0
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36 | eyvr=0.0
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37 |
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38 | ifivr=ivrml1(nml)
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39 | i1s=imsml1(nml)+nmsml(nml)
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40 |
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41 | do io=ifivr+ntlvr-1,ifivr,-1 ! ______ over variables in desc. order
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42 | iv=iorvr(io) ! index of var.
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43 |
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44 | ia=iatvr(iv) ! prim.mv.at
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45 | it=ityvr(iv) ! type
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46 | ic=iclvr(iv) ! class
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47 |
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48 | if (it.eq.3) then ! torsion
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49 | vr=toat(ia)
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50 |
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51 | e0=e0to(ic)
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52 | if (e0.ne.0.0) eyvr=eyvr+e0*(1.0+sgto(ic)*cos(vr*rnto(ic)))
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53 |
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54 | elseif (it.eq.2) then ! b.angle
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55 | vr=baat(ia)
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56 | elseif (it.eq.1) then ! b.length
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57 | vr=blat(ia)
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58 | endif
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59 |
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60 | i2s=i1s-1 ! last m.s per 'iv'
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61 | i1s=imsvr1(iv) ! 1st m.s
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62 |
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63 | do ims=i1s,i2s ! __ loop over m.s
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64 | i1=latms1(ims)
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65 | i2=latms2(ims)
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66 |
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67 | do i=i1,i2 ! __ loop over atoms i ===================
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68 |
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69 | ity=ityat(i)
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70 | cqi=conv*cgat(i)
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71 |
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72 | xi=xat(i)
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73 | yi=yat(i)
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74 | zi=zat(i)
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75 |
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76 | do ivw=ivwat1(i),ivwat2(i) ! over vdW-domains of 'i'
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77 | do j=lvwat1(ivw),lvwat2(ivw) ! atoms j
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78 |
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79 | jty=ityat(j)
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80 |
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81 | xj=xat(j)
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82 | yj=yat(j)
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83 | zj=zat(j)
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84 |
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85 | xij=xj-xi
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86 | yij=yj-yi
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87 | zij=zj-zi
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88 |
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89 | rij2=xij*xij+yij*yij+zij*zij
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90 | rij6=rij2**3
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91 | rij12=rij6*rij6
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92 | rij=sqrt(rij2)
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93 | if(epsd) then
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94 | c --------------------------------- distance dependent dielectric constant
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95 | sr=slp_f*rij
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96 | ep=plt-(sr*sr+2.0*sr+2.0)*(plt-1.0)*exp(-sr)/2.0
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97 | else
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98 | ep=1.0d0
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99 | end if
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100 |
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101 | eyel=eyel+cqi*cgat(j)/(rij*ep)
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102 |
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103 | evw=aij(ity,jty)/rij12-cij(ity,jty)/rij6
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104 |
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105 | ijhb=ihbty(ity,jty)
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106 | if (ijhb.ne.0.and.rij.le.cohb) then ! HB Possible
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107 |
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108 | if (ijhb.gt.0) then ! i=H,j=acceptor
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109 | iowh=iowat(i)
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110 | px=xi-xat(iowh)
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111 | py=yi-yat(iowh)
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112 | pz=zi-zat(iowh)
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113 | else ! i=acceptor,j=H
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114 | jowh=iowat(j)
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115 | px=xat(jowh)-xj
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116 | py=yat(jowh)-yj
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117 | pz=zat(jowh)-zj
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118 | endif
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119 |
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120 | cth=(xij*px+yij*py+zij*pz)/(rij*
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121 | # sqrt(px*px+py*py+pz*pz))
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122 |
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123 | if (cth.gt.0.0) then
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124 | eyhb=eyhb+ evw + cth*(
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125 | # (ahb(ity,jty)-aij(ity,jty))/rij12-
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126 | # (chb(ity,jty)-cij(ity,jty))/rij6 )
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127 | else ! No Hydrogen Bond
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128 | eyvw=eyvw + evw
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129 | endif
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130 | else
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131 | eyvw=eyvw + evw
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132 | endif
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133 |
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134 | enddo ! ... atoms j
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135 | enddo ! ... vdW-domains of i
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136 |
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137 | do i14=i14at1(i),i14at2(i) ! over 1-4 partners of 'i'
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138 | j=l14at(i14)
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139 |
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140 | jty=ityat(j)
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141 |
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142 | xj=xat(j)
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143 | yj=yat(j)
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144 | zj=zat(j)
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145 |
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146 | xij=xj-xi
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147 | yij=yj-yi
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148 | zij=zj-zi
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149 |
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150 | rij2=xij*xij+yij*yij+zij*zij
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151 | rij6=rij2**3
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152 | rij12=rij6*rij6
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153 | rij=sqrt(rij2)
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154 | if(epsd) then
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155 | c --------------------------------- distance dependent dielectric constant
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156 | sr=slp_f*rij
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157 | ep=plt-(sr*sr+2.0*sr+2.0)*(plt-1.)*exp(-sr)/2.0
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158 | else
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159 | ep=1.0d0
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160 | end if
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161 |
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162 | eyel=eyel+ cqi*cgat(j)/(rij*ep)
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163 |
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164 | evw=a14(ity,jty)/rij12-cij(ity,jty)/rij6
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165 |
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166 | ijhb=ihbty(ity,jty)
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167 | if (ijhb.ne.0.and.rij.le.cohb) then ! HB Possible
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168 |
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169 | if (ijhb.gt.0) then ! i=H,j=acceptor
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170 | iowh=iowat(i)
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171 | px=xi-xat(iowh)
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172 | py=yi-yat(iowh)
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173 | pz=zi-zat(iowh)
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174 | else ! i=acceptor,j=H
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175 | jowh=iowat(j)
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176 | px=xat(jowh)-xj
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177 | py=yat(jowh)-yj
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178 | pz=zat(jowh)-zj
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179 | endif
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180 |
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181 | cth=(xij*px+yij*py+zij*pz)/(rij*
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182 | # sqrt(px*px+py*py+pz*pz))
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183 |
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184 | if (cth.gt.0.0) then
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185 | eyhb=eyhb+ evw + cth*(
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186 | # (ahb(ity,jty)-a14(ity,jty))/rij12-
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187 | # (chb(ity,jty)-cij(ity,jty))/rij6 )
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188 | else ! No Hydrogen Bond
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189 | eyvw=eyvw + evw
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190 | endif
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191 | else
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192 | eyvw=eyvw + evw
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193 | endif
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194 |
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195 | enddo ! ... 1-4-partners of i
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196 |
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197 | enddo ! ... atoms i
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198 | enddo ! ... m.s.
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199 |
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200 | enddo ! ... variables
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201 |
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202 | eysm = eyel + eyvw + eyhb + eyvr
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203 | enyflx=eysm
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204 | return
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205 | end
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206 |
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