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**Reading Logan's Class B ceilings.** - The fraction **70 / 30** means ceiling **7 000 MSL**, floor **3 000 MSL** (add two zeros to each number). - The fraction **70 / SFC** means ceiling **7 000 MSL**, floor is the surface. - **All altitudes are in MSL unless in parentheses** — if you see "(12)", that's **1 200 ft AGL**.

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