Corrigendum to "Enhanced selectivity and sensitivity of the first harmonic detection in a compact differential photoacoustic cell for sensing ammonia at trace levels". (Measurement (2025) 244, (S0263224124023492), (10.1016/j.measurement.2024.116464))

The authors regret for the units reported for sensitivity slopes in two locations within the article. In both cases, the units were incorrectly listed as μV/ppmv instead of V/ppmv.
Correction 1
In the Abstract, the text currently reads:
“Calibration curves demonstrated superior sensitivity of FHD (SlopeFHD = (2.15 ± 0.01) × 10-7 μV/ppmv) compared to the second harmonic detection (SlopeSHD = (1.621 ± 0.005) × 10-7 μV/ppmv) and the amplitude modulation (SlopeAM = (2.010 ± 0.002) × 10-7 μV/ppmv).”
It should read:
“Calibration curves demonstrated superior sensitivity of FHD (SlopeFHD = (2.15 ± 0.01) × 10-7 V/ppmv) compared to the second harmonic detection (SlopeSHD = (1.621 ± 0.005) × 10-7 V/ppmv) and the amplitude modulation (SlopeAM = (2.010 ± 0.002) × 10-7 V/ppmv).”
Correction 2
In the Concluding remarks and outlook section, the text currently reads:
“The calibration curves further demonstrated better sensitivity of the FHD mode (SlopeFHD = (2.15 ± 0.01) × 10-7 μV/ppmv), surpassing both SHD (SlopeSHD = (1.621 ± 0.005) × 10-7 μV/ppmv) and AM (SlopeAM = (2.010 ± 0.002) × 10-7 μV/ppmv).”
It should read:
“The calibration curves further demonstrated better sensitivity of the FHD mode (SlopeFHD = (2.15 ± 0.01) × 10-7 V/ppmv), surpassing both SHD (SlopeSHD = (1.621 ± 0.005) × 10-7 V/ppmv) and AM (SlopeAM = (2.010 ± 0.002) × 10-7 V/ppmv).”
The authors would like to apologize for any inconvenience caused.