| Jan | Feb |
| 360 | 365 |
| 324 | 325 | January/February Ozone Column |
| 377 | 359 |
| 336 | 352 | In the following pairs the data represents the thickness of the ozone column in Dobson units: |
| 383 | 397 | one milli-centimeter ozone at standard temperature and pressure. |
| 361 | 351 | A = monthly mean thickness in January |
| 369 | 367 | B = monthly mean thickness in February |
| 349 | 397 | The data are paired by year for a random sample of 15 years. |
| 301 | 335 | Reference: Laboratorium f_r Atmospharensphysic, Switzerland |
| 354 | 338 |
| 344 | 349 |
| 329 | 393 |
| 337 | 370 |
| 387 | 400 |
| 378 | 411 |
asiddiq4
ozonecolumnthickness1.xlsx
