Article Images Columbus external experiments installed during spacewalk   SOLAR and EuTEF are circled   SOLAR External Payload Facility has three complementary instruments: SOVIM (SOlar Variable and Irradiance Monitor) covers the near-ultraviolet, visible and thermal regions of the spectrum, SOL-ACES (SOLar Auto-Calibrating Extreme UV/UV Spectrophotometers) measures the extreme ultraviolet, and SOLSPEC (SOLar SPECtral Irradiance measurements) covers the 180–3000 nm large wavelength range.   External Facilities: European Technology Exposure Facility (EuTEF). Release date: 20 February 2008