Flow-charts.md

@@ -43,4 +43,35 @@ graph TD
 
 ### Preprocessing
 
+**Processing that can be done separately on each channel**
+```mermaid
+graph TD 
+   h[(Data from channel)]
+   h-->A(Downsample)
+   A-->B(High pass filter)
+   B-->C(Crop buffer seconds)
+   C-->D[Preprocessed time series]
+   style A fill:#f00,stroke:#f00
+   style B fill:#bbf,stroke:#bbf
+   style D fill:#bbf,stroke:#bbf
+   style D2 fill:#f00,stroke:#ff0
+   style F fill:#bbf,stroke:#bbf
+```
+
+**Processing done on both channels
+
+```mermaid
+graph TD 
+   A1[Preprocessed time series 1]
+   A2[Preprocessed time series 2]
+   A1-->B1(PSD, Welch)
+   A2-->B2(PSD, Welch)
+   A1-->B3(FFT and CSD)
+   A2-->B3
+   B3-->C(Coarse graining)
+   B1-->D1[PSD 1]
+   B2-->D2[PSD 2]
+   C-->D3[CSD]
+```
+
 # Simulation
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