1. Run the Bash script to extract soft_lengths for particle 1 and particle 2 in chombo files for Common Envelop module.
    ./softLengthsCM.sh out

2. The result will save to a text file(output.txt as default if filename not given in Step 1) with three columns. Column 1 is the frame numbers -- depending on how many chombo files in out; Column 2 and 3 are the soft_length for particle 1 & 2 correspondingly 

3. Copy and paste the python script readTextToList.py to Visit Commands window and run it. It will read the output.txt file and save to three lists: frame[], sl_p1[], sl_p2[]. Then the soft_length values in the lists can be used to do contours as the Example in the python script shows.