1. The simulation programs are supplemented with a journal paper (Rev. Sci. Instrum. 2020, 91, 075106, DOI:10.1063/5.0002377).All codes have been coded in English and can generate Gaussian white noise, mix signals with set SNRs, perform LIF calculations, and obtain frequency, amplitude, phase difference, and SNR values.

2. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and the associated documentation files (the "Software") to use the Software without restriction, including without limitation of the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the conditions of citing or referring to the current article titled “Lock-in frequency measurement with high precision and efficiency”. Feedback information to improve the LIF simulation software is welcome and should be submitted to the current author using the corresponding email address.

3. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
