Table: rare_earth_magnet_data
Columns: magnet
b_r_t
h_ci_ka_m
bh_max_kj_m_3
t_c_c

Question: When  0.6–1.4 is the b r (t) what is the h ci (ka/m)?
SQL: SELECT "h_ci_ka_m" FROM rare_earth_magnet_data WHERE "b_r_t" = '0.6–1.4'

Question: When nd 2 fe 14 b (bonded) is the magnet how many measurements of tc (°c)?
SQL: SELECT COUNT("t_c_c") FROM rare_earth_magnet_data WHERE "magnet" = 'Nd 2 Fe 14 B (bonded)'

Question: When 720 is the t c (°c) what is the   h ci (ka/m)?
SQL: SELECT "h_ci_ka_m" FROM rare_earth_magnet_data WHERE "t_c_c" = '720'