The picture shows the experimental strain sensitivity of EXPLORER (input noise spectral amplitude in units of Hz^-1/2) in 2003. The sensitivity at the two resonances is about 2 10^-21Hz^-1/2. The spectral amplitude is better than 1 10^-20Hz^-1/2 over a band of about 35 Hz. The peak at 945 Hz is a calibration reference signal fed into the d.c. SQUID amplifier to monitor the gain of the electronics

The detector duty cycle is about 80% due to cryogenic operations and maintenance.