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Table 1.
NPOI calibrators.
| HD | Sp. | V | V − K | E(B − V) | θV − K |  |
|---|---|---|---|---|---|---|
| type | [mag] | [mag] | [mag] | [mas] | ||
| FK5 423 | A2V | 3.34 | 0.26 | −0.06 | 0.86 | 0.88 |
| FK5 447 | A0V | 2.44 | 0.01 | 0.02 | 1.11 | 0.81 |
| FK5 456 | A3Vv | 3.31 | 0.21 | 0.00 | 0.84 | 0.90 |
| FK5 472 | B6IIIp | 3.87 | 0.05 | 0.02 | 0.59 | 0.89 |
| HR 5062 | A5V | 4.01 | 0.87 | 0.01 | 0.67 | 0.95 |
| FK5 509 | B3V | 1.86 | −0.41 | 0.01 | 1.11 | 0.81 |
| HR 5329 | A8IV | 4.54 | 0.44 | −0.05 | 0.56 | 0.79 |
| FK5 622 | O9.5V | 2.60 | −0.08 | 0.29 | 0.00 | 1.00 |
| FK5 668 | A0V | 3.75 | 0.13 | 0.06 | 0.65 | 0.93 |
| FK5 677 | B5Ib | 3.97 | −0.03 | 0.12 | 0.50 | 0.97 |
| FK5 913 | A1Vn | 4.36 | 0.10 | 0.01 | 0.48 | 0.99 |
Notes. 
is minimum (squared) visibility on the longest baselines used.
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