Include Freq array for freq plotting.
Remove the printing of variables used for debugging.
Change program to use the list of image files in a loop
Ignore wav files.
ignore m4a files.
Add and subtract lines for easier reading.
Import time module for efficiency  testing
Minor spacing changes.
Include edit to data to file function so as to work with python 2.7
Include minor spacing changes.
Include comment narrowing down the bottle neck.
Correct spacial frequency function
Include magnetic field function
Include initialization of variable for main function
Include change to ask for the name of calibration file
Include the graphing of all 8 files in subplots
Include the graphing of the slice graphs of all 8 files
include minor spacing change.
Include the packaging of the data for use and graphing
Include code for graphing the final product