Problem detected - Solution 1. The group is listed twice in a day in "gpr". - Deletion of the duplicated rows: 18801230.289 406 0 1 77 309 46 185 0.552 149.5 190.7 -31.1 -19.0 1885 628.412 1711 0 0 11 53 6 28 0.326 169.5 145.3 -15.9 -3.7 1886 529.529 1887 0 7 0 27 0 18 0.665 72.5 5.5 11.4 -41.6 1969 320.313 21933 0 4 10 36 7 24 0.653 131.5 58.5 -31.4 -34.8 2. The row contains no position data. - Deletion of the false rows: 1880 328. 0 31610 0 0 0 0 0 0.000 0.0 0.0 0.0 0.0 1876 730. 0 217 0 0 0 0 0 0 0.507 269.5 0.0 0.0 0.0 1880 328. 0 31610 0 0 0 0 0 0.000 0.0 0.0 0.0 0.0 3. The observational time and location of two groups are not the same on a given day in the "gpr" file. - Deletion of the row with deviating observation: 18811116.394 37601 0 0 0 8 0 6 0.749 117.5 241.1 -20.3 -49.4 (deleted, Greenwich (G) observation was listed among Kodaikanal (I) observations in the "gpr" file) while 18811116.135 601 0 2 0 8 0 6 0.750 252.5 343.6 -12.1 49.7 (I, remained) 18811116.135 603 0 5 199 917 103 475 0.233 18.5 289.3 15.7 -4.6 (I, remained) 18811116.135 605 0 1 15 63 11 45 0.713 60.5 251.4 22.8 -42.5 (I, remained) 18811116.135 606 0 5 32 136 33 150 0.895 71.5 231.2 17.6 -62.7 (I, remained) 18811116.135 607 0 6 55 281 76 435 0.946 79.4 222.7 10.8 -71.2 (I, remained) 4. There is a group in the "saf" with no pair in the "gpr". - The data of the missing group are keyed into "gpr": 1874 417.485 82 0 0 0 208 0 113 0.388 61.2 113.3 5.8 -19.9 1874 418.506 82 0 0 0 117 0 60 0.210 26.7 114.3 5.6 -5.4 1874 427.556 83 0 0 0 150 0 171 0.899 101.7 296.0 -12.4 -64.1 1874 428.574 83 0 0 53 285 41 221 0.766 102.6 297.0 -12.4 -49.7 1874 429.663 83 0 0 53 306 33 189 0.594 105.8 296.6 -12.6 -35.7 1874 430.577 83 0 0 72 369 40 205 0.428 112.1 296.3 -13.0 -23.9 1874 5 1.539 83 0 0 62 369 32 191 0.249 130.0 296.2 -13.0 -11.3 1874 5 2.499 83 0 0 88 349 45 178 0.167 187.3 296.0 -13.3 1.2 1874 5 4.571 83 0 0 43 284 25 164 0.500 248.6 295.9 -13.7 28.5 1874 5 5.490 83 0 0 24 200 16 133 0.660 253.2 295.6 -13.6 40.4 1874 5 6.432 83 0 0 25 227 21 188 0.797 256.0 295.1 -13.2 52.3 1874 5 7.515 83 0 0 27 149 34 188 0.920 256.5 295.2 -13.7 66.7 1874 430.577 84 0 0 0 46 0 24 0.284 316.8 331.5 7.9 11.3 1874 5 1.539 84 0 0 0 60 0 34 0.455 295.6 331.8 7.7 24.3 1874 5 2.499 84 0 0 0 46 0 29 0.622 288.1 331.3 8.0 36.5 1874 5 1.539 85 0 1 0 38 0 42 0.893 92.1 244.4 -3.7 -63.1 1874 5 2.499 85 0 1 14 168 11 132 0.777 91.9 243.9 -3.9 -50.9 1874 5 4.571 85 0 1 53 593 28 314 0.330 93.8 248.2 -4.7 -19.2 1874 5 5.490 85 0 1 61 548 31 277 0.128 102.6 248.1 -5.1 -7.1 1874 5 6.432 85 0 1 22 645 11 324 0.083 245.6 247.1 -5.4 4.3 1874 5 7.515 85 0 1 73 494 39 264 0.344 263.8 248.4 -5.3 19.9 1874 5 8.552 85 0 1 70 428 42 258 0.558 264.8 248.5 -5.6 33.8 1874 5 9.497 85 0 1 48 322 35 233 0.721 265.9 248.3 -5.1 46.0 1881 513.403 474 0 0 7 14 14 28 0.970 83.3 166.1 5.7 -75.3 1882 326.497 707 0 0 0 8 0 5 0.468 237.6 41.5 -20.6 24.9 1882 423.512 739 0 7 3 20 1 11 0.315 328.1 16.5 10.8 9.7 18821218.208 913 0 7 43 368 25 205 0.444 62.6 70.2 10.3 -23.6 18821227.162 920 0 0 33 183 42 230 0.919 103.9 269.4 -13.8 -66.4 1884 3 7.454 1309 0 0 7 58 6 51 0.830 91.2 283.2 -5.0 -56.2 1884 3 8. 0 1309 0 0 11 56 7 37 0.675 90.0 283.3 -4.9 -42.4 1885 831.210 1758 0 2 9 49 5 27 0.407 233.9 44.7 -7.0 19.3 1886 228.196 1846 0 0 0 32 0 17 0.279 242.8 174.7 -14.3 14.8 1886 5 1.433 1872 0 0 0 51 0 148 0.986 270.2 138.9 -0.5 80.2 18871231.231 2026 0 0 24 108 44 195 0.962 97.1 227.0 -7.7 -74.2 1890 516.398 2126 0 0 0 4 0 16 0.992 69.4 295.9 20.1 -81.2 1897 1 1.502 4489 0 0 0 38 0 121 0.988 256.6 167.9 -13.7 81.2 1897 717.226 4594 0 0 0 7 0 6 0.856 259.7 67.8 -6.2 57.7 1897 717.226 4598 0 0 12 77 6 40 0.194 156.9 5.2 -5.2 -4.4 1897 718.511 4598 0 0 22 110 11 58 0.314 236.4 7.9 -5.2 15.2 1897 719.128 4598 0 0 15 70 9 40 0.436 246.0 8.1 -5.7 23.6 1897 718.511 4599 0 0 0 23 0 83 0.911 100.2 271.5 -9.4 -81.2 1897 719.128 4599 0 0 8 36 14 66 0.963 100.9 271.4 -9.1 -73.1 1897 720.417 4599 0 0 6 40 6 36 0.840 105.0 272.2 -9.7 -55.2 1897 721.141 4599 0 0 4 25 3 19 0.747 107.1 271.7 -9.2 -46.1 1897 720.417 4600 0 0 12 100 28 245 0.980 76.5 248.2 14.3 -79.2 1897 721.141 4600 0 0 23 147 32 207 0.937 76.4 247.9 14.5 -69.9 1897 722.218 4600 0 0 45 224 40 198 0.828 76.1 247.7 14.4 -55.9 1897 723.443 4600 0 0 69 257 33 167 0.646 74.8 247.6 13.8 -39.8 1897 724.460 4600 0 0 47 273 27 153 0.459 70.4 247.6 13.7 -26.3 1897 725.462 4600 0 0 48 278 25 143 0.264 56.7 247.6 13.7 -13.1 1897 726.328 4600 0 0 40 313 20 158 0.144 9.3 247.9 13.7 -1.4 1897 727.648 4600 0 0 42 218 22 113 0.308 298.7 247.9 13.9 16.1 1897 728.248 4600 0 0 46 213 26 118 0.429 290.2 248.1 13.7 24.3 1897 729.187 4600 0 0 44 221 27 139 0.605 284.4 248.2 13.3 36.8 1897 731.423 4600 0 1 12 63 15 76 0.909 282.5 248.2 14.3 66.3 1897 721.141 4601 0 0 2 29 3 36 0.914 101.5 253.0 -8.1 -64.8 1897 722.218 4601 0 0 99 438 82 356 0.790 103.9 253.0 -7.6 -50.6 1897 723.443 4601 0 0 117 752 80 473 0.607 111.0 252.6 -8.1 -34.8 1897 724.460 4601 0 0 143 739 79 409 0.429 122.2 252.4 -8.0 -21.5 1897 725.462 4601 0 0 174 1048 90 541 0.227 152.5 253.3 -8.4 -7.4 1897 726.328 4601 0 0 102 1099 52 572 0.265 197.1 253.9 -8.7 4.6 1897 727.648 4601 0 0 99 642 56 363 0.470 238.8 255.8 -8.8 24.0 1897 728.248 4601 0 0 105 601 64 370 0.588 245.5 256.6 -9.3 32.8 1897 729.187 4601 0 0 70 417 54 319 0.756 251.7 258.0 -9.8 46.6 1903 527.478 5035 0 0 0 33 0 19 0.478 317.6 236.0 19.5 19.9 1906 1 3.218 5767 0 0 0 8 0 12 0.936 288.3 320.4 15.8 67.5 191611 3.163 84403 0 0 5 27 3 17 0.592 241.9 256.9 -12.7 32.2 1917 8 9.353 8197 0 7 4 26 3 19 0.715 73.1 94.6 16.5 -45.3 1926 218.406 9876 5 1 28 180 25 160 0.827 295.9 118.3 16.8 50.8 1927 614.418 10319 2 7 2 7 1 4 0.452 298.9 220.0 13.5 21.9 1927 614.418 10320 1 0 2 5 1 3 0.399 322.1 213.1 19.2 15.0 1932 1 2.397 104703 0 0 4 7 2 4 0.392 261.9 230.9 - 6.1 9.6 19341127.361 11602 2 4 3 46 2 29 0.597 193.8 266.8 -34.1 9.9 1936 228.613 11830 1 6 40 162 30 124 0.758 235.5 17.4 -30.5 46.3 19371029.435 12591 1 0 18 97 17 90 0.846 78.1 155.5 12.5 -57.8 19371029.435 12592 2 0 13 48 21 77 0.952 103.6 142.8 -11.4 -70.5 1938 321.374 12758 1 9 4 11 4 10 0.841 309.2 176.3 27.4 47.1 1938 527.340 12825 2 4 23 146 41 275 0.964 256.6 38.8 -13.2 74.2 19391024.349 115111 0 0 8 27 4 14 0.237 131.6 354.1 -4.0 -10.2 19391210.439 13489 1 0 15 82 45 248 0.987 60.5 24.5 29.0 -79.0 1940 327.396 13553 2 2 13 27 9 19 0.718 298.2 162.2 14.8 40.7 1942 418.357 1404611 0 4 18 2 9 0.090 43.2 273.0 -1.5 -3.5 1942 419.386 1404611 0 2 12 1 6 0.181 288.0 272.9 -1.9 9.9 1942 7 1.526 14073 0 0 2 9 1 5 0.511 114.7 347.5 -9.7 -28.0 194210 7.583 1409910 0 0 4 0 2 0.087 83.7 154.6 6.9 -5.0 194210 8.564 1409910 0 2 14 1 7 0.147 273.5 155.1 6.8 8.5 19421018.298 1410110 0 0 4 0 5 0.930 85.2 309.6 6.5 -68.6 19421019.558 1410110 0 2 15 2 13 0.828 86.6 305.6 5.9 -56.0 1943 319.322 1414510 0 0 10 0 5 0.193 115.9 165.1 -11.8 -10.2 1943 320.327 1414510 0 6 28 3 14 0.124 210.4 165.7 -13.1 3.7 1943 321.337 1414510 0 6 23 3 12 0.324 249.5 166.8 -13.1 18.1 1943 617.313 1415910 0 2 6 1 4 0.560 271.0 99.9 1.7 33.9 1943 618.355 1415910 0 0 5 0 5 0.763 269.3 101.8 0.4 49.5 1943 7 8.323 1416110 0 2 12 1 6 0.143 307.7 154.4 8.7 6.5 1943 7 9.368 1416110 0 4 22 2 12 0.370 284.1 155.3 8.7 21.2 1943 710.359 1416110 0 5 22 3 14 0.604 278.2 158.0 8.0 37.0 1943 713.319 1416110 0 2 7 5 16 0.977 276.7 159.7 7.5 77.9 1943 721.500 1416120 0 5 21 3 14 0.658 265.1 14.4 0.5 40.8 1943 722.500 1416120 0 0 5 0 4 0.824 267.8 14.6 1.1 55.2 1943 817.443 1416710 0 0 5 0 3 0.425 119.2 315.5 -5.3 -21.8 1943 818.370 1416710 0 0 15 0 8 0.249 152.7 318.4 -6.0 -6.6 1944 710.578 1420010 0 8 35 4 18 0.282 127.2 310.9 - 5.9 -16.4 1944 711.338 1420010 0 0 18 0 9 0.176 164.9 314.7 - 5.7 -2.6 19441028.460 1422810 0 4 29 3 21 0.713 67.7 271.8 19.1 -44.1 19441030.449 1422810 0 4 26 2 14 0.342 46.8 274.6 17.8 -15.1 19451024.473 123201 0 0 11 50 20 92 0.962 245.9 301.3 -21.5 70.4 19611231.335 20364 0 0 0 11 0 7 0.649 286.9 1.5 8.6 38.7 1968 830.446 21730 0 7 6 44 3 23 0.298 202.7 240.8 -8.8 6.7 5. The observational dates of a given group are different in the "saf" and in the "gpr." - The date is cheked against the book and the "saf" or "gpr" is corrected appropriately. 6.The name of the group in the "saf" differs from its name in the "gpr". - The name is checked against the book and the "saf" or "gpr" is corrected appropriately. The symbols *, **, #, ## are transformed to letters a, b, c in "gpr" in the years 1874-1915 but the names created from the Carrington rotation are remained unchanged in the years 1956-1976. 7. The difference between the position of the group derived from the "saf" that of in the "gpr" is larger than 1 degree. - Check errors against the books. 8. The difference between the corrected area of a group in the "saf" and the same type of data in the "gpr" is larger than 5 msh (1874-1955). - Check errors against the books. The total daily area data computed from "gpr" data are different from the date in summaries (1956-1976) - Check errors against the books. 9. The difference between the B, and L heliographic coordinates and those values B, and L that are computed from the polar coordinates (polar angle and relative radius) is larger than a radius-dependent threshold. - Recalculation of the polar coordinates. 10. The difference between the published projected area and the projected area computed from the corrected area is larger than 10 msd and 10%. - Recalculation of the projected area.