Viewer-1:-Opening-a-raw-datafile.md

+Open the viewer by running `main_viewer` and click 'Open Folder'
+![image](uploads/69e1c840d3fc320987cff0c02acef36c/image.png)
+
+Select the folder containing your datafiles
+![image](uploads/b7c93f30172bc1638804770304e19d46/image.png)
+
+Select the file you'd like to open. This may take some time as the MATLAB HDF5 library is slow.
+![image](uploads/a5b10c2dcc3a9c034e9d1c17029cc117/image.png)
+
+Select the 'Calibrate' tab.
+![image](uploads/fe48fb40599a517074b4637ff675bbbb/image.png)
+
+Select a range of data that covers your area of interest. Smaller areas will process faster.
+![image](uploads/04753bc4824bbe514b2518a8e4db31c8/image.png)
+
+Enter the detector angle about which the data is symmetric. This is important for data processing. The data should now be symmetric about an angle of 0
+![image](uploads/15a571cd59578835b3a3c9b2d875f6a3/image.png)
+
+Add a gold calibration file, produced by the tool described in '[Making a Gold Calibration File ](Making-a-Gold-Calibration-File)
+![image](uploads/e610e351f9a1caa88425bb4705fb80f1/image.png)
+
+These calibration options can be saved to a file from this tool with the 'Save Config' Option'
+Save the file anywhere you like.
+![image](uploads/e5db15502fbb9e92077c8dc342dd7dba/image.png)
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