Thanks! Curious under what circumstances the respiration was off - were you standing or sitting down? I can usually see the resp wave go up and down as I breathe while sitting down.
I have written up a technical report on the validation here: https://arxiv.org/abs/2510.27028 This validation is based on several datasets, which all have gold standard ground truth from contact PPG and RESP from chest straps and/or impedance pneumography (from ECG)