Heart@Tracker
|  Fig. 2. Baseline recording. Live PPG and cardiotachogram display |  Fig. 3. RSA Training. RSA feedback display. Breathing pacemaker is active | 
|  Fig. 4. RSA Training. Live cardiotachogram and HRT power spectrum display |  Fig. 5. RSA Training. RSA parameters trend display | 
|  Fig. 6. RSA Training. RSA Level vs RSA Stability Diagram. Older readings are in darker colors. The goal is to reach green zone |  Fig. 7. Session Summary. RSA Training Evaluation | 
|  Fig. 8. Session Summary. RSA Parameters History |  Fig. 9. Progress Summary. RSA Parameters Across Sessions | 
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