user: Question: What is the range (varies by payload weight) for Shahab-4?
Columns: ['Name/Designation', 'Class', 'Range (varies with payload weight)', 'Payload', 'Status']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Fajr-3', 'MRBM', '2,000km', '800kg', 'Operational']
SQL:

assistant: SELECT "Range (varies with payload weight)" FROM "Table" WHERE "Name/Designation" = 'Shahab-4';