Update README.md

README.md

@@ -8,4 +8,11 @@ tags:
 pretty_name: SimScan
 size_categories:
 - 100B<n<1T
----
+---
+
+load the simulated scan with code
+```
+df_scan = pd.read_hdf(filename, key=scan_pattern)
+```
+where `filename` is the `.h5` file name; `scan_pattern` is set with `scan_pattern = 'lissajous'`, `scan_pattern = 'raster'`, or `scan_pattern = 'raster_r'`.
+`'lissajous'` indicates Lissajous scan mode describe in the paper, and `'raster'` for Raster scan mode. (`'raster_r'` is another Raster scan mode that the frame ends by returning to the starting point.)