| 1 | A closeup showing deep background with sharp sidewalls. | |
| 2 | Up to 20 percent of the top airflow should bleed off down the sidewalls. | |
| 3 | Remember, backgrounds should be flat with well defined sidewalls. | |
| 4 | Sandy soil will demand special actions to prevent sidewall collapse of pits. | |
| 5 | The X-ray type is blue and has two walls. |
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