Henry_Hub_Gas_Prices_Daily.csv and Henry_Hub_Gas_Prices_Monthly.csv are two csv files created by using the script file data_wrangler.py on the data file RNGWHHDd.xls D3 contains index.html file for the graph representation using D3.js Helping material used for D3:Read D3 Tips and Tricks v4.x. (n.d.). Retrieved from https://leanpub.com/d3-t-and-t-v4/read.
Third commit