Question About data format and white noise and random walk of IMU 

I would like first to thank you for your effort in collecting the data and making it public for others to use.I want to ask about accelerometer.csv and gyro.csv.What is the data format? Is it timestamp,x,y,z? And I saw that you gave the iPhone IMU (approximate) additive biases,could you please provide the specific values of white noise and random walk of IMU?