| You need a browser with JavaScript support in order to view the molecule in 3D |
|
Transitions — Left-clk & drag: Zoom; Right-clk: reset |
|
Frequency [wavenumbers] |
Wavelength [microns] |
Integrated cross-section [km/mol] |
Symmetry | Scaling factor |
|---|---|---|---|---|
| 3080 | 3.247 | 9.11 | A | 0.9597 |
| 3078 | 3.249 | 15.04 | A | 0.9597 |
| 3069 | 3.258 | 78.4 | A | 0.9597 |
| 3068 | 3.259 | 80.34 | A | 0.9597 |
| 3068 | 3.259 | 154 | A | 0.9597 |
| 3068 | 3.26 | 94.5 | A | 0.9597 |
| 3068 | 3.26 | 38.67 | A | 0.9597 |
| 3058 | 3.271 | 16 | A | 0.9597 |
| 3054 | 3.274 | 9.875 | A | 0.9597 |
| 3053 | 3.275 | 22.09 | A | 0.9597 |
| 3053 | 3.276 | 11.99 | A | 0.9597 |
| 3052 | 3.276 | 73.33 | A | 0.9597 |
| 3052 | 3.277 | 37.5 | A | 0.9597 |
| 3051 | 3.278 | 5.674 | A | 0.9597 |
| 3050 | 3.278 | 14.32 | A | 0.9597 |
| 3050 | 3.279 | 16.21 | A | 0.9597 |
| 3049 | 3.279 | 7.692 | A | 0.9597 |
| 3049 | 3.28 | 0.1095 | A | 0.9597 |
| 3048 | 3.281 | 0.6461 | A | 0.9597 |
| 3048 | 3.281 | 0.0742 | A | 0.9597 |
| 3047 | 3.282 | 1.633 | A | 0.9597 |
| 3047 | 3.282 | 0.748 | A | 0.9597 |
| 3021 | 3.31 | 75.6 | A | 0.9597 |
| 1624 | 6.158 | 3.513 | A | 0.9691 |
| 1622 | 6.166 | 9.175 | A | 0.9691 |
| 1618 | 6.181 | 0.8244 | A | 0.9691 |
| 1613 | 6.198 | 3.305 | A | 0.9691 |
| 1610 | 6.211 | 3.368 | A | 0.9691 |
| 1607 | 6.222 | 3.184 | A | 0.9691 |
| 1603 | 6.239 | 10.34 | A | 0.9691 |
| 1600 | 6.25 | 92.7 | A | 0.9691 |
| 1598 | 6.259 | 7.323 | A | 0.9691 |
| 1596 | 6.265 | 9.348 | A | 0.9691 |
| 1594 | 6.273 | 29.92 | A | 0.9691 |
| 1586 | 6.304 | 0.3382 | A | 0.9691 |
| 1585 | 6.311 | 6.653 | A | 0.9691 |
| 1578 | 6.337 | 40.37 | A | 0.9691 |
| 1573 | 6.358 | 44.29 | A | 0.9691 |
| 1572 | 6.362 | 52.98 | A | 0.9691 |
| 1571 | 6.364 | 4.564 | A | 0.9691 |
| 1567 | 6.381 | 17.84 | A | 0.9691 |
| 1562 | 6.401 | 73.8 | A | 0.9691 |
| 1557 | 6.423 | 2.73 | A | 0.9691 |
| 1553 | 6.439 | 23.48 | A | 0.9691 |
| 1552 | 6.443 | 12.58 | A | 0.9691 |
| 1539 | 6.498 | 17.3 | A | 0.9691 |
| 1532 | 6.528 | 0.4801 | A | 0.9691 |
| 1527 | 6.551 | 0.0098 | A | 0.9691 |
| 1516 | 6.595 | 0.4537 | A | 0.9691 |
| 1510 | 6.622 | 6.999 | A | 0.9691 |
| 1507 | 6.638 | 3.865 | A | 0.9691 |
| 1504 | 6.648 | 2.31 | A | 0.9691 |
| 1502 | 6.657 | 3.676 | A | 0.9691 |
| 1497 | 6.682 | 8.492 | A | 0.9691 |
| 1487 | 6.724 | 25.56 | A | 0.9691 |
| 1478 | 6.767 | 2.7 | A | 0.9691 |
| 1477 | 6.77 | 2.66 | A | 0.9691 |
| 1471 | 6.797 | 5.263 | A | 0.9691 |
| 1471 | 6.8 | 21.46 | A | 0.9691 |
| 1465 | 6.826 | 0.3692 | A | 0.9691 |
| 1462 | 6.838 | 5.393 | A | 0.9691 |
| 1460 | 6.85 | 12.59 | A | 0.9691 |
| 1456 | 6.866 | 8.789 | A | 0.9691 |
| 1456 | 6.868 | 6.707 | A | 0.9691 |
| 1452 | 6.886 | 3.164 | A | 0.9691 |
| 1449 | 6.902 | 11.73 | A | 0.9691 |
| 1444 | 6.925 | 24.32 | A | 0.9691 |
| 1444 | 6.927 | 15.22 | A | 0.9691 |
| 1436 | 6.962 | 9.83 | A | 0.9691 |
| 1430 | 6.991 | 4.115 | A | 0.9691 |
| 1428 | 7.003 | 0.5945 | A | 0.9691 |
| 1424 | 7.023 | 16.17 | A | 0.9691 |
| 1422 | 7.03 | 4.297 | A | 0.9691 |
| 1417 | 7.055 | 26.37 | A | 0.9691 |
| 1413 | 7.078 | 5.627 | A | 0.9691 |
| 1410 | 7.09 | 11.6 | A | 0.9691 |
| 1409 | 7.098 | 8.364 | A | 0.9691 |
| 1407 | 7.108 | 24.89 | A | 0.9691 |
| 1404 | 7.12 | 1.509 | A | 0.9691 |
| 1403 | 7.128 | 0.2328 | A | 0.9691 |
| 1400 | 7.144 | 13.31 | A | 0.9691 |
| 1398 | 7.151 | 7.648 | A | 0.9691 |
| 1394 | 7.172 | 7.982 | A | 0.9691 |
| 1392 | 7.182 | 7.258 | A | 0.9691 |
| 1390 | 7.192 | 1.848 | A | 0.9691 |
| 1390 | 7.197 | 5.374 | A | 0.9691 |
| 1389 | 7.202 | 2.623 | A | 0.9691 |
| 1386 | 7.214 | 1.104 | A | 0.9691 |
| 1383 | 7.229 | 6.529 | A | 0.9691 |
| 1382 | 7.235 | 3.155 | A | 0.9691 |
| 1377 | 7.264 | 6.819 | A | 0.9691 |
| 1375 | 7.275 | 2.995 | A | 0.9691 |
| 1371 | 7.292 | 4.373 | A | 0.9691 |
| 1371 | 7.296 | 2.79 | A | 0.9691 |
| 1370 | 7.299 | 8.073 | A | 0.9691 |
| 1363 | 7.336 | 6.653 | A | 0.9691 |
| 1363 | 7.339 | 32.04 | A | 0.9691 |
| 1359 | 7.36 | 1.054 | A | 0.9691 |
| 1355 | 7.38 | 29.43 | A | 0.9691 |
| 1353 | 7.393 | 10.14 | A | 0.9691 |
| 1349 | 7.413 | 4.663 | A | 0.9691 |
| 1347 | 7.423 | 7.384 | A | 0.9691 |
| 1341 | 7.455 | 18.43 | A | 0.9691 |
| 1339 | 7.467 | 66.8 | A | 0.9691 |
| 1336 | 7.484 | 32.09 | A | 0.9691 |
| 1329 | 7.522 | 16.44 | A | 0.9691 |
| 1328 | 7.531 | 22.4 | A | 0.9691 |
| 1319 | 7.58 | 1.265 | A | 0.9691 |
| 1312 | 7.622 | 33.25 | A | 0.9691 |
| 1310 | 7.631 | 10.03 | A | 0.9691 |
| 1307 | 7.649 | 34.02 | A | 0.9691 |
| 1305 | 7.666 | 12.48 | A | 0.9691 |
| 1295 | 7.722 | 31.87 | A | 0.9691 |
| 1293 | 7.732 | 31.76 | A | 0.9691 |
| 1289 | 7.756 | 18.85 | A | 0.9691 |
| 1287 | 7.773 | 36.67 | A | 0.9691 |
| 1282 | 7.799 | 29.81 | A | 0.9691 |
| 1277 | 7.83 | 14.54 | A | 0.9691 |
| 1270 | 7.877 | 14.11 | A | 0.9691 |
| 1269 | 7.881 | 28.46 | A | 0.9691 |
| 1264 | 7.912 | 1.525 | A | 0.9691 |
| 1258 | 7.95 | 11.86 | A | 0.9691 |
| 1254 | 7.975 | 13.58 | A | 0.9691 |
| 1226 | 8.16 | 132.5 | A | 0.9691 |
| 1216 | 8.226 | 37.46 | A | 0.9691 |
| 1211 | 8.254 | 4.877 | A | 0.9691 |
| 1208 | 8.277 | 4.112 | A | 0.9691 |
| 1208 | 8.281 | 0.9565 | A | 0.9691 |
| 1206 | 8.293 | 0.2022 | A | 0.9691 |
| 1203 | 8.309 | 11.92 | A | 0.9691 |
| 1200 | 8.334 | 14.73 | A | 0.9691 |
| 1194 | 8.373 | 5.746 | A | 0.9691 |
| 1185 | 8.439 | 5.957 | A | 0.9691 |
| 1184 | 8.445 | 5.741 | A | 0.9691 |
| 1180 | 8.473 | 2.764 | A | 0.9691 |
| 1179 | 8.483 | 6.94 | A | 0.9691 |
| 1176 | 8.504 | 4.206 | A | 0.9691 |
| 1166 | 8.578 | 1.28 | A | 0.9691 |
| 1163 | 8.6 | 37 | A | 0.9691 |
| 1159 | 8.63 | 29.15 | A | 0.9691 |
| 1158 | 8.633 | 13.99 | A | 0.9691 |
| 1150 | 8.694 | 51 | A | 0.9691 |
| 1144 | 8.739 | 37.3 | A | 0.9691 |
| 1140 | 8.772 | 0.0582 | A | 0.9691 |
| 1127 | 8.875 | 14.58 | A | 0.9691 |
| 1117 | 8.95 | 4.723 | A | 0.9691 |
| 1115 | 8.97 | 97.3 | A | 0.9691 |
| 1113 | 8.982 | 14.56 | A | 0.9691 |
| 1092 | 9.154 | 4.68 | A | 0.9691 |
| 1086 | 9.21 | 20.78 | A | 0.9794 |
| 1080 | 9.257 | 4.085 | A | 0.9794 |
| 1079 | 9.268 | 7.308 | A | 0.9794 |
| 1075 | 9.305 | 26.14 | A | 0.9794 |
| 1054 | 9.483 | 11.51 | A | 0.9794 |
| 1047 | 9.552 | 1.381 | A | 0.9794 |
| 1044 | 9.574 | 0.5302 | A | 0.9794 |
| 1042 | 9.594 | 16.36 | A | 0.9794 |
| 1041 | 9.605 | 11.31 | A | 0.9794 |
| 1037 | 9.639 | 2.993 | A | 0.9794 |
| 970.9 | 10.3 | 3.027 | A | 0.9794 |
| 958.3 | 10.44 | 0.0164 | A | 0.9794 |
| 957.8 | 10.44 | 1.1 | A | 0.9794 |
| 957.3 | 10.45 | 0.0037 | A | 0.9794 |
| 956 | 10.46 | 0.001 | A | 0.9794 |
| 955 | 10.47 | 0.0028 | A | 0.9794 |
| 953 | 10.49 | 0.03 | A | 0.9794 |
| 944 | 10.59 | 0.787 | A | 0.9794 |
| 941.2 | 10.62 | 5.187 | A | 0.9794 |
| 932.6 | 10.72 | 0.0936 | A | 0.9794 |
| 922.4 | 10.84 | 15.71 | A | 0.9794 |
| 919.2 | 10.88 | 4.259 | A | 0.9794 |
| 915.9 | 10.92 | 5.657 | A | 0.9794 |
| 912.4 | 10.96 | 13.36 | A | 0.9794 |
| 896.4 | 11.16 | 88.3 | A | 0.9794 |
| 894 | 11.19 | 99.83 | A | 0.9794 |
| 891.1 | 11.22 | 2.802 | A | 0.9794 |
| 888.7 | 11.25 | 3.342 | A | 0.9794 |
| 887.1 | 11.27 | 9.128 | A | 0.9794 |
| 885.5 | 11.29 | 13.41 | A | 0.9794 |
| 885 | 11.3 | 0.8908 | A | 0.9794 |
| 884.7 | 11.3 | 16.54 | A | 0.9794 |
| 864.1 | 11.57 | 14.29 | A | 0.9794 |
| 861.8 | 11.6 | 2.607 | A | 0.9794 |
| 857.4 | 11.66 | 6.531 | A | 0.9794 |
| 851.1 | 11.75 | 0.1344 | A | 0.9794 |
| 845.3 | 11.83 | 3.075 | A | 0.9794 |
| 841.5 | 11.88 | 0.7928 | A | 0.9794 |
| 830.1 | 12.05 | 6.232 | A | 0.9794 |
| 829.4 | 12.06 | 15.55 | A | 0.9794 |
| 810.9 | 12.33 | 5.012 | A | 0.9794 |
| 801.7 | 12.47 | 6.536 | A | 0.9794 |
| 801 | 12.48 | 27.18 | A | 0.9794 |
| 798.1 | 12.53 | 0.3469 | A | 0.9794 |
| 797.7 | 12.54 | 8.124 | A | 0.9794 |
| 797.5 | 12.54 | 1.939 | A | 0.9794 |
| 796.1 | 12.56 | 1.694 | A | 0.9794 |
| 792.7 | 12.62 | 0.1125 | A | 0.9794 |
| 787.8 | 12.69 | 0.8851 | A | 0.9794 |
| 784.5 | 12.75 | 0.0143 | A | 0.9794 |
| 780.6 | 12.81 | 5.018 | A | 0.9794 |
| 777.1 | 12.87 | 0.2326 | A | 0.9794 |
| 775.2 | 12.9 | 1.174 | A | 0.9794 |
| 756.1 | 13.23 | 4.951 | A | 0.9794 |
| 754.3 | 13.26 | 1.517 | A | 0.9794 |
| 746.1 | 13.4 | 1.088 | A | 0.9794 |
| 745.5 | 13.41 | 0.0769 | A | 0.9794 |
| 742.5 | 13.47 | 0.1009 | A | 0.9794 |
| 742.2 | 13.47 | 0.608 | A | 0.9794 |
| 740.1 | 13.51 | 0.4457 | A | 0.9794 |
| 738.5 | 13.54 | 0.7956 | A | 0.9794 |
| 736.7 | 13.57 | 0.2187 | A | 0.9794 |
| 735.6 | 13.6 | 0.3765 | A | 0.9794 |
| 731 | 13.68 | 4.394 | A | 0.9794 |
| 718.2 | 13.92 | 5.662 | A | 0.9794 |
| 717.7 | 13.93 | 0.0565 | A | 0.9794 |
| 716.5 | 13.96 | 0.1987 | A | 0.9794 |
| 715.9 | 13.97 | 0.0092 | A | 0.9794 |
| 714.3 | 14 | 3.974 | A | 0.9794 |
| 711.1 | 14.06 | 0.0458 | A | 0.9794 |
| 705.7 | 14.17 | 0.8575 | A | 0.9794 |
| 705 | 14.18 | 0.1538 | A | 0.9794 |
| 695.8 | 14.37 | 1.467 | A | 0.9794 |
| 677 | 14.77 | 0.1449 | A | 0.9794 |
| 669.2 | 14.94 | 0.3534 | A | 0.9794 |
| 666.3 | 15.01 | 0.291 | A | 0.9794 |
| 664.5 | 15.05 | 0.045 | A | 0.9794 |
| 655.8 | 15.25 | 0.0079 | A | 0.9794 |
| 651.6 | 15.35 | 0.7182 | A | 0.9794 |
| 649.7 | 15.39 | 0.3889 | A | 0.9794 |
| 649 | 15.41 | 2.752 | A | 0.9794 |
| 646.8 | 15.46 | 0.3609 | A | 0.9794 |
| 643.6 | 15.54 | 2.318 | A | 0.9794 |
| 643.1 | 15.55 | 0.1625 | A | 0.9794 |
| 637.8 | 15.68 | 0.0193 | A | 0.9794 |
| 632.8 | 15.8 | 0.1375 | A | 0.9794 |
| 632.4 | 15.81 | 0.2043 | A | 0.9794 |
| 631.1 | 15.84 | 0.6605 | A | 0.9794 |
| 630.3 | 15.86 | 0.3222 | A | 0.9794 |
| 629.5 | 15.89 | 0.0358 | A | 0.9794 |
| 628.5 | 15.91 | 0.5899 | A | 0.9794 |
| 625.4 | 15.99 | 0.0776 | A | 0.9794 |
| 622.1 | 16.08 | 0.3436 | A | 0.9794 |
| 615 | 16.26 | 0.0289 | A | 0.9794 |
| 608.5 | 16.43 | 0.0043 | A | 0.9794 |
| 604.9 | 16.53 | 1.92 | A | 0.9794 |
| 604.9 | 16.53 | 1.701 | A | 0.9794 |
| 603.3 | 16.58 | 4.018 | A | 0.9794 |
| 596.7 | 16.76 | 0.599 | A | 0.9794 |
| 593.3 | 16.85 | 0.4447 | A | 0.9794 |
| 592 | 16.89 | 0.3885 | A | 0.9794 |
| 590.7 | 16.93 | 0.0953 | A | 0.9794 |
| 589.4 | 16.97 | 2.547 | A | 0.9794 |
| 588.4 | 17 | 14.66 | A | 0.9794 |
| 585.2 | 17.09 | 0.0665 | A | 0.9794 |
| 585 | 17.09 | 7.401 | A | 0.9794 |
| 582.6 | 17.17 | 4.487 | A | 0.9794 |
| 582.2 | 17.18 | 1.367 | A | 0.9794 |
| 575.9 | 17.36 | 0.2439 | A | 0.9794 |
| 572.4 | 17.47 | 0.8563 | A | 0.9794 |
| 571.9 | 17.49 | 3.674 | A | 0.9794 |
| 568.1 | 17.6 | 2.444 | A | 0.9794 |
| 566.6 | 17.65 | 2.521 | A | 0.9794 |
| 561.9 | 17.8 | 0.222 | A | 0.9794 |
| 556.7 | 17.96 | 3.98 | A | 0.9794 |
| 556.1 | 17.98 | 0.1859 | A | 0.9794 |
| 553.8 | 18.06 | 0.1622 | A | 0.9794 |
| 551.3 | 18.14 | 0.2491 | A | 0.9794 |
| 549.7 | 18.19 | 0.0949 | A | 0.9794 |
| 542.5 | 18.43 | 1.988 | A | 0.9794 |
| 539.4 | 18.54 | 2.86 | A | 0.9794 |
| 537.9 | 18.59 | 0.1513 | A | 0.9794 |
| 534.9 | 18.7 | 0.1403 | A | 0.9794 |
| 519.6 | 19.25 | 0.0066 | A | 0.9794 |
| 512.7 | 19.51 | 0.2537 | A | 0.9794 |
| 508.2 | 19.68 | 0.1103 | A | 0.9794 |
| 506.3 | 19.75 | 0.624 | A | 0.9794 |
| 501.6 | 19.94 | 1.862 | A | 0.9794 |
| 498.9 | 20.04 | 1.474 | A | 0.9794 |
| 495.9 | 20.17 | 1.039 | A | 0.9794 |
| 493.8 | 20.25 | 0.7599 | A | 0.9794 |
| 480.8 | 20.8 | 0.0794 | A | 0.9794 |
| 473.7 | 21.11 | 0.8064 | A | 0.9794 |
| 449.5 | 22.25 | 0.7809 | A | 0.9794 |
| 448.4 | 22.3 | 1.435 | A | 0.9794 |
| 444 | 22.52 | 0.4231 | A | 0.9794 |
| 442.9 | 22.58 | 0.3538 | A | 0.9794 |
| 440.9 | 22.68 | 0.0253 | A | 0.9794 |
| 435.1 | 22.98 | 0.3637 | A | 0.9794 |
| 430.8 | 23.21 | 1.839 | A | 0.9794 |
| 430.1 | 23.25 | 0.172 | A | 0.9794 |
| 421.9 | 23.7 | 0.1729 | A | 0.9794 |
| 421.3 | 23.74 | 0.042 | A | 0.9794 |
| 420 | 23.81 | 0.2818 | A | 0.9794 |
| 417.5 | 23.95 | 0.2703 | A | 0.9794 |
| 412.4 | 24.25 | 0.4033 | A | 0.9794 |
| 409 | 24.45 | 0.0238 | A | 0.9794 |
| 405.9 | 24.64 | 0.1064 | A | 0.9794 |
| 402.3 | 24.86 | 0.0132 | A | 0.9794 |
| 401.4 | 24.91 | 3.771 | A | 0.9794 |
| 400.1 | 24.99 | 2.602 | A | 0.9794 |
| 398.3 | 25.1 | 0.4129 | A | 0.9794 |
| 386.6 | 25.87 | 0.4773 | A | 0.9794 |
| 381.5 | 26.21 | 0.5561 | A | 0.9794 |
| 373.9 | 26.75 | 0.0047 | A | 0.9794 |
| 372.7 | 26.83 | 0.0116 | A | 0.9794 |
| 369 | 27.1 | 0.1305 | A | 0.9794 |
| 359.8 | 27.79 | 0.2469 | A | 0.9794 |
| 357.9 | 27.94 | 1.091 | A | 0.9794 |
| 352.2 | 28.39 | 0.108 | A | 0.9794 |
| 344.5 | 29.02 | 0.2999 | A | 0.9794 |
| 320.6 | 31.19 | 0.3307 | A | 0.9794 |
| 318.7 | 31.38 | 0.0277 | A | 0.9794 |
| 317 | 31.55 | 0.174 | A | 0.9794 |
| 313.3 | 31.91 | 0.078 | A | 0.9794 |
| 305.5 | 32.74 | 3.421 | A | 0.9794 |
| 304.1 | 32.88 | 0.2334 | A | 0.9794 |
| 295.4 | 33.85 | 0.0254 | A | 0.9794 |
| 292.9 | 34.14 | 0.9638 | A | 0.9794 |
| 292.3 | 34.21 | 0.0751 | A | 0.9794 |
| 283.7 | 35.25 | 0.2563 | A | 0.9794 |
| 277.7 | 36.02 | 0.0119 | A | 0.9794 |
| 264.6 | 37.79 | 1.034 | A | 0.9794 |
| 245.3 | 40.77 | 0.011 | A | 0.9794 |
| 241.4 | 41.42 | 0.1538 | A | 0.9794 |
| 239.1 | 41.82 | 0.2089 | A | 0.9794 |
| 238.8 | 41.88 | 0.0308 | A | 0.9794 |
| 233.8 | 42.77 | 0.058 | A | 0.9794 |
| 215.6 | 46.38 | 0.0076 | A | 0.9794 |
| 207.1 | 48.29 | 0.0702 | A | 0.9794 |
| 203.9 | 49.03 | 0.2289 | A | 0.9794 |
| 203.9 | 49.05 | 7.981 | A | 0.9794 |
| 202.8 | 49.3 | 9.496 | A | 0.9794 |
| 189.2 | 52.86 | 1.024 | A | 0.9794 |
| 188.8 | 52.96 | 0.3626 | A | 0.9794 |
| 182.5 | 54.81 | 0.068 | A | 0.9794 |
| 174 | 57.48 | 0.0257 | A | 0.9794 |
| 172.3 | 58.04 | 0.4517 | A | 0.9794 |
| 134.3 | 74.44 | 0.1326 | A | 0.9794 |
| 132.9 | 75.27 | 0.0474 | A | 0.9794 |
| 130.2 | 76.82 | 1.848 | A | 0.9794 |
| 127.3 | 78.54 | 0 | A | 0.9794 |
| 126.1 | 79.33 | 0.1228 | A | 0.9794 |
| 83.26 | 120.1 | 0.0612 | A | 0.9794 |
| 83.15 | 120.3 | 0.1369 | A | 0.9794 |
| 73.61 | 135.8 | 0.2237 | A | 0.9794 |
| 71.71 | 139.4 | 0.0511 | A | 0.9794 |
| 57.55 | 173.8 | 0.0491 | A | 0.9794 |
| 44.27 | 225.9 | 0.059 | A | 0.9794 |
| 29.35 | 340.7 | 0.603 | A | 0.9794 |
| 23.28 | 429.6 | 0.0003 | A | 0.9794 |
| 23.18 | 431.4 | 0.0445 | A | 0.9794 |
Note(s):
You are kindly asked to consider the following references for citation when using the database: