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3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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4 | <head> |
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5 | <title>curl.pro (SAXO Documentation Assistant)</title> |
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6 | </head> |
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45 | <table border="0" cellpadding="0" cellspacing="0" width="98%" bgcolor="#F0F0FF" valign="bottom"> |
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46 | <tr> |
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47 | <td width="10%"> |
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48 | <a href="bsf.html"><img src="./../prev.gif" border="0" alt="Previous"></a></td> |
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49 | <td width="80%" align="center" valign="center"> |
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50 | <font size=-1><i>SAXO Documentation Assistant</i>: <a href="./../home.html">Overview</a></font></td> |
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51 | <td width="10%" align="right"> |
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52 | <a href="div.html"><img src="./../next.gif" border="0" alt="Next"></a></td> |
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53 | </tr> |
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54 | </table> |
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55 | |
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56 | |
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57 | <h1><font size="-2">Computation/</font></h1> |
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58 | <h2>curl.pro</h2> |
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59 | |
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60 | <dl> |
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61 | </dl> |
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62 | |
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63 | |
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64 | Calculate the vertical component of the curl of a vectors field |
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65 | located on Arakawa C-grid. |
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66 | |
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67 | |
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68 | |
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69 | |
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70 | |
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71 | <a name="#_curl"></a> |
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72 | |
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73 | <h2>curl <font size="-1" color="#006633"> |
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74 | Calculation |
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75 | </font></h2> |
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76 | |
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77 | <p><font face="Courier"><i>result = </i>curl(<i><a href="#_curl_keyword_uu">uu</a>, <a href="#_curl_keyword_vv">vv</a></i>, <a href="#_curl_keyword_DIREC">DIREC</a>=<i>scalar string</i>, <a href="#_curl_keyword_MILLION">MILLION</a>=<i>scalar: 0 or 1</i>, <a href="#_curl_keyword__EXTRA">_EXTRA</a>=<i>_EXTRA</i>)</font></p> |
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78 | |
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79 | |
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80 | |
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81 | |
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82 | <h3>Return value</h3> |
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83 | the vertical component of the curl of the input data (with the same |
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84 | size) located at F point (see restrictions) |
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85 | |
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86 | |
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87 | |
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88 | <h3>Parameters</h3> |
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89 | |
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90 | |
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91 | <a name="#_curl_keyword_uu"></a> |
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92 | <h4>uu |
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93 | |
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94 | |
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95 | |
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96 | |
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97 | |
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98 | |
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99 | |
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100 | |
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101 | </h4> |
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102 | |
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103 | |
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104 | Matrix representing the zonal coordinates (at U point) of a field of vectors |
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105 | A 2D (xy), 3D (xyz or yt) or a structure readable by <a href="..//ToBeReviewed/LECTURE/litchamp.html">litchamp</a> and containing |
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106 | a 2D (xy), 3D (xyz or yt) array (4D case is not coded yet). |
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107 | Note that the dimension of the array must suit the domain dimension. |
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108 | |
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109 | |
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110 | |
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111 | <a name="#_curl_keyword_vv"></a> |
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112 | <h4>vv |
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113 | |
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114 | |
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115 | |
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116 | |
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117 | |
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118 | |
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119 | |
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120 | |
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121 | </h4> |
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122 | |
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123 | |
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124 | Matrix representing the meridional coordinates (at V point) of a field of vectors |
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125 | A 2D (xy), 3D (xyz or yt) or a structure readable by <a href="..//ToBeReviewed/LECTURE/litchamp.html">litchamp</a> and containing |
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126 | a 2D (xy), 3D (xyz or yt) array (4D case is not coded yet). |
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127 | Note that the dimension of the array must suit the domain dimension. |
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128 | |
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129 | |
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130 | |
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131 | |
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132 | |
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133 | <h3>Keywords</h3> |
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134 | |
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135 | |
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136 | <a name="#_curl_keyword_DIREC"></a> |
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137 | <h4>DIREC |
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138 | |
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139 | |
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140 | |
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141 | |
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142 | |
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143 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>scalar string</i></font> |
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144 | |
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145 | |
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146 | </h4> |
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147 | |
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148 | |
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149 | Use if you want to call <a href="..//ToBeReviewed/CALCULS/moyenne.html">moyenne</a> or |
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150 | <a href="..//ToBeReviewed/CALCULS/grossemoyenne.html">grossemoyenne</a> after the div computation |
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151 | with a mean done in the DIREC direction |
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152 | |
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153 | |
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154 | <a name="#_curl_keyword_MILLION"></a> |
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155 | <h4>MILLION |
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156 | |
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157 | |
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158 | |
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159 | |
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160 | |
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161 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>scalar: 0 or 1</i></font> |
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162 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>0</i></font> |
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163 | |
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164 | </h4> |
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165 | |
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166 | |
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167 | Activate to multiply returned array by 1.e6 |
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168 | |
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169 | |
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170 | <a name="#_curl_keyword__EXTRA"></a> |
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171 | <h4>_EXTRA |
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172 | |
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173 | |
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174 | |
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175 | |
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176 | |
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177 | |
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178 | |
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179 | |
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180 | </h4> |
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181 | |
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182 | |
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183 | Used to declare that this routine accepts inherited keywords |
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184 | |
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185 | |
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186 | |
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187 | |
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188 | <h3>Examples</h3><pre> |
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189 | |
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190 | </pre><h3>Version history</h3> |
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191 | |
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192 | <h4>Version</h4> |
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193 | $Id: curl.pro 371 2008-08-07 09:32:02Z pinsard $ |
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194 | |
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195 | <h4>History</h4> |
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196 | Guillaume Roullet (grlod@ipsl.jussieu.fr) |
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197 | Sebastien Masson (smasson@lodyc.jussieu.fr) |
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198 | adaptation to work with a reduce domain |
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199 | 21/5/1999: missing values at !values.f_nan |
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200 | |
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201 | |
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202 | |
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203 | <h3>Known issues</h3> |
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204 | |
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205 | |
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206 | <h4>Todo items</h4> |
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207 | code the 4D case |
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208 | |
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209 | <h4>Restrictions</h4> |
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210 | |
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211 | - Works only for Arakawa C-grid. |
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212 | - UU must be on U grid, VV must be on V grid |
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213 | - 4D case is not coded yet |
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214 | - the common variable jpt is used to differ xyz (jpt=1) and xyt (jpt=1) cases. |
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215 | - U and V arrays are cut in the same geographic domain. Because of the shift between |
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216 | T, U, V and F grids, it is possible that these two arrays do not have the same |
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217 | size and refer to different indexes. In this case, arrays are re-cut on |
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218 | common indexes. To avoid these re-cuts, use the keyword /memeindice in |
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219 | <a href="..//ToBeReviewed/GRILLE/domdef.html">domdef</a> |
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220 | - When computing the divergence, we update, vargrid, varname, varunits and the |
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221 | grid position parameters (firstxf, lastxf, nxf, firstyf, lastyf, nyf). |
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222 | - points that cannot be computed (domain boundaries, coastline) are set to NaN |
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223 | |
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224 | |
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225 | <h3>Other attributes</h3> |
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226 | |
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227 | |
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228 | <h4>Uses routines</h4> |
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229 | <a href="..//Commons/cm_4cal.html">cm_4cal</a> |
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230 | <a href="..//Commons/cm_4data.html">cm_4data</a> |
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231 | <a href="..//Commons/cm_4mesh.html">cm_4mesh</a> |
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232 | |
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233 | |
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234 | |
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235 | |
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236 | |
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237 | <font size="-3"><p> </p></font> |
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238 | <hr size="1" color="#CCCCCC"/> |
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243 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0.</font></p> |
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244 | |
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245 | </body> |
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246 | </html> |
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