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(a) Sketch and (b) picture of COLD2 instrument. QCL: Quantum Cascade Laser; BS: beam-splitter; ET: etalon; RC: reference cell; RD: reference detector; MPC: multipass cell; MD: main detector; AL: red laser for alignment; F: humidity filter; LD: QCL driver; TC: QCL temperature controller; cRIO: CompactRIO crate; PS: power supply; P: pump; AP: access point for wireless remote control.
