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Table A.4
Same as Table A.1 but for the Schmidt backbone.
| Id | Observer | Start | End | N d | M d |
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| 292 | Schmidt, Athens | 1841 | 1883 | 6970 | |
| 298 | Wolf, R., Zurich | 1848 | 1893 | 18 311 | 4153 |
| 307 | Carrington, London | 1853 | 1860 | 1215 | 204 |
| 311 | Weber, Peckeloh | 1859 | 1883 | 6983 | 4035 |
| 318 | Spoerer, G., Anclam | 1861 | 1893 | 6281 | 2449 |
| 323 | Ferrari, Rome | 1866 | 1879 | 478 | 429 |
| 324 | Leppig, Leipzig | 1867 | 1881 | 2611 | 1979 |
| 325 | Dawson, W.M., Spiceland, Ind | 1867 | 1890 | 1623 | 824 |
| 328 | Tacchini, Rome | 1871 | 1900 | 7584 | 2388 |
| 330 | Billwiller, Zurich | 1872 | 1875 | 308 | 286 |
| 331 | Sawyer, E.F., Cambridgeport | 1872 | 1874 | 282 | 273 |
| 342 | Janesch, Laibach | 1882 | 1887 | 1164 | 439 |
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