user: Question: When 720 is the t c (°c) what is the   h ci (ka/m)?
Columns: ['Magnet', 'B r (T)', 'H ci (kA/m)', '(BH) max (kJ/m 3 )', 'T c (°C)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Nd 2 Fe 14 B (sintered)', '1.0–1.4', '750–2000', '200–440', '310–400']
SQL:

assistant: SELECT "H ci (kA/m)" FROM "Table" WHERE "T c (°C)" = '720';