Table schema:
CREATE TABLE table_name_73 (semimajor_axis___au__ VARCHAR, mass VARCHAR)

Question: What Semimajor axis (AU) has a Mass of ≥ 3.5 ± 1.4 m⊕?
SQL: SELECT semimajor_axis___au__ FROM table_name_73 WHERE mass = "≥ 3.5 ± 1.4 m⊕"