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| Section (mean depth, μm) | S1 (825) | S2 (675) | S3 (525) | S4 (375) | S5 (225) | S6 (75) |
|---|---|---|---|---|---|---|
| S1(825) | *** | *** | ** | *** | ||
| S2(675) | *** | *** | ||||
| S3(525) | *** | *** | ||||
| S4(375) | ** | *** | ||||
| S5(225) | *** | |||||
| S6(75) |
Significance is indicated at three probability levels
* p < 0.05
** p < 0.01
*** p < 0.001.
