Table 1.
The counts on the CCD camera and the estimated beam current as a function of spot size.
| spot | CCD camera counts (arb. units) |
estimated beam current (pA) |
| 10 | 2.1 | 1.1 |
| 9 | 3.5 | 1.9 |
| 8 | 5.9 | 3.2 |
| 7 | 11.0 | 6.0 |
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