1 | #include <iostream> |
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2 | #include <string> |
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3 | #include <wcs.h> |
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4 | #include <wcshdr.h> |
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5 | #include <fitshdr.h> |
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6 | #include <wcsfix.h> |
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7 | #include <wcsunits.h> |
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8 | #define WCSLIB_GETWCSTAB // define this so that we don't try and redefine |
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9 | // wtbarr (this is a problem when using gcc v.4+ |
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10 | #include <fitsio.h> |
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11 | #include <math.h> |
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12 | #include <duchamp.hh> |
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13 | #include <Cubes/cubes.hh> |
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14 | |
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15 | int FitsHeader::defineWCS(string fname, Param &par) |
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16 | { |
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17 | /** |
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18 | * FitsHeader::defineWCS(wcsprm *wcs, char *hdr, Param &par) |
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19 | * A function that reads the WCS header information from the |
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20 | * FITS file given by fptr. |
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21 | * It will also sort out the spectral axis, and covert to the correct |
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22 | * velocity type, or frequency type if need be. |
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23 | * It calls FitsHeader::readBUNIT so that the Integrated Flux units can |
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24 | * be calculated by FitsHeader::fixUnits. |
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25 | */ |
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26 | |
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27 | fitsfile *fptr; |
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28 | int bitpix,numAxes; |
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29 | int noComments = 1; //so that fits_hdr2str will ignore COMMENT, HISTORY etc |
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30 | int nExc = 0,nkeys; |
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31 | char *hdr; |
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32 | |
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33 | // Open the FITS file |
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34 | int status = 0; |
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35 | if( fits_open_file(&fptr,fname.c_str(),READONLY,&status) ){ |
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36 | fits_report_error(stderr, status); |
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37 | return FAILURE; |
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38 | } |
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39 | |
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40 | // Get the dimensions of the FITS file -- number of axes and size of each. |
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41 | status = 0; |
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42 | if(fits_get_img_dim(fptr, &numAxes, &status)){ |
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43 | fits_report_error(stderr, status); |
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44 | return FAILURE; |
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45 | } |
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46 | long *dimAxes = new long[numAxes]; |
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47 | for(int i=0;i<numAxes;i++) dimAxes[i]=1; |
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48 | status = 0; |
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49 | if(fits_get_img_size(fptr, numAxes, dimAxes, &status)){ |
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50 | fits_report_error(stderr, status); |
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51 | return FAILURE; |
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52 | } |
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53 | |
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54 | // Read in the entire PHU of the FITS file to a string. |
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55 | // This will be read by the wcslib functions to extract the WCS. |
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56 | status = 0; |
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57 | fits_hdr2str(fptr, noComments, NULL, nExc, &hdr, &nkeys, &status); |
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58 | if( status ){ |
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59 | duchampWarning("defineWCS","Error whilst reading FITS header to string: "); |
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60 | fits_report_error(stderr, status); |
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61 | return FAILURE; |
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62 | } |
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63 | |
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64 | // Close the FITS file -- not needed any more in this function. |
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65 | status = 0; |
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66 | fits_close_file(fptr, &status); |
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67 | if (status){ |
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68 | duchampWarning("defineWCS","Error closing file: "); |
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69 | fits_report_error(stderr, status); |
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70 | } |
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71 | |
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72 | wcsprm *wcs = new wcsprm; |
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73 | |
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74 | // Initialise the wcsprm structure |
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75 | int flag; |
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76 | if(flag = wcsini(true,numAxes,wcs)){ |
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77 | std::stringstream errmsg; |
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78 | errmsg << "wcsini failed! Code=" << flag |
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79 | << ": " << wcs_errmsg[flag] << std::endl; |
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80 | duchampError("defineWCS",errmsg.str()); |
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81 | return FAILURE; |
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82 | } |
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83 | wcs->flag=-1; |
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84 | |
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85 | int relax=1; // for wcspih -- admit all recognised informal WCS extensions |
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86 | int ctrl=2; // for wcspih -- report each rejected card and its reason for |
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87 | // rejection |
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88 | int nwcs, nreject; |
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89 | // Parse the FITS header to fill in the wcsprm structure |
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90 | if(flag = wcspih(hdr, nkeys, relax, ctrl, &nreject, &nwcs, &wcs)) { |
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91 | // if here, something went wrong -- report what. |
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92 | std::stringstream errmsg; |
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93 | errmsg << "wcspih failed!\n" |
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94 | << "WCSLIB error code="<<flag<<": "<<wcs_errmsg[flag]<<std::endl; |
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95 | duchampWarning("defineWCS",errmsg.str()); |
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96 | } |
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97 | else{ |
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98 | int stat[NWCSFIX]; |
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99 | // Applies all necessary corrections to the wcsprm structure |
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100 | // (missing cards, non-standard units or spectral types, ...) |
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101 | if(flag=wcsfix(1,(const int*)dimAxes,wcs,stat)) { |
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102 | std::stringstream errmsg; |
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103 | errmsg << "wcsfix failed:\n"; |
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104 | for(int i=0; i<NWCSFIX; i++) |
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105 | if (stat[i] > 0) |
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106 | errmsg <<"WCSLIB error code="<<flag<<": " |
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107 | << wcsfix_errmsg[stat[i]]<<std::endl; |
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108 | duchampWarning("defineWCS", errmsg.str() ); |
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109 | } |
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110 | |
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111 | // Set up the wcsprm struct. Report if something goes wrong. |
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112 | if(flag=wcsset(wcs)){ |
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113 | std::stringstream errmsg; |
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114 | errmsg<<"wcsset failed!\n" |
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115 | <<"WCSLIB error code="<<flag <<": "<<wcs_errmsg[flag]<<std::endl; |
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116 | duchampWarning("defineWCS",errmsg.str()); |
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117 | } |
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118 | |
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119 | if(wcs->naxis>2){ // if there is a spectral axis |
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120 | |
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121 | int index = wcs->spec; |
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122 | string desiredType,specType = wcs->ctype[index]; |
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123 | if(wcs->restfrq != 0){ |
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124 | // Set the spectral axis to a standard specification: VELO-F2V |
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125 | desiredType = duchampVelocityType; |
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126 | if(wcs->restwav == 0) wcs->restwav = 299792458.0 / wcs->restfrq; |
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127 | this->spectralDescription = duchampSpectralDescription[VELOCITY]; |
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128 | } |
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129 | else{ |
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130 | // No rest frequency defined, so put spectral dimension in frequency. |
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131 | // Set the spectral axis to a standard specification: FREQ |
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132 | duchampWarning("defineWCS", |
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133 | "No rest frequency defined. Using frequency units in spectral axis.\n"); |
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134 | desiredType = duchampFrequencyType; |
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135 | par.setSpectralUnits("MHz"); |
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136 | if(strcmp(wcs->cunit[index],"")==0){ |
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137 | duchampWarning("defineWCS", |
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138 | "No frequency unit given. Assuming frequency axis is in Hz.\n"); |
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139 | strcpy(wcs->cunit[index],"Hz"); |
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140 | } |
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141 | this->spectralDescription = duchampSpectralDescription[FREQUENCY]; |
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142 | } |
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143 | |
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144 | // Check to see if the spectral type (eg VELO-F2V) matches that wanted |
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145 | // from duchamp.hh. Only first four characters checked. |
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146 | if(strncmp(specType.c_str(),desiredType.c_str(),4)!=0){ |
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147 | index = -1; |
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148 | // If not a match, translate the spectral axis to the desired type |
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149 | if( flag = wcssptr(wcs, &index, (char *)desiredType.c_str())){ |
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150 | std::stringstream errmsg; |
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151 | errmsg<<"wcssptr failed! Code="<<flag <<": " |
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152 | <<wcs_errmsg[flag]<<std::endl; |
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153 | duchampWarning("defineWCS",errmsg.str()); |
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154 | } |
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155 | } |
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156 | |
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157 | } // end of if(numAxes>2) |
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158 | |
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159 | // Save the wcs to the FitsHeader class that is running this function |
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160 | this->setWCS(wcs); |
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161 | this->setNWCS(nwcs); |
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162 | |
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163 | wcsfree(wcs); |
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164 | |
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165 | } |
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166 | |
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167 | // Get the brightness unit, so that we can set the units for the |
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168 | // integrated flux when we go to fixUnits. |
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169 | |
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170 | this->readBUNIT(fname); |
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171 | |
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172 | this->fixUnits(par); |
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173 | |
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174 | return SUCCESS; |
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175 | |
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176 | } |
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