create a ERD diagram (entity relationshio model)

for the water vapor levels in different cities. representation shown below

Average Water Vapor Denver, Co 4.7 g/m^3 Phoenix, AZ 6.8 4 g/m^3 Chicago, IL 8.44 g/m^3 New York City, NY 8.64 g/m^3 Los Angeles, CA 9.4 g/m^3 Atlanta, GA 11.0 g/m^3 Dallas, TX 11.8 g/m^3 Miami, FI 17.2 g/m^3