Material Design Metrics and keylines

I keep coming back to this material design spec page http://www.google.com/design/spec/layout/metrics-keylines.html to take the dimensions i need often so i made this small cheat sheet with the information that i need often :

Standard screen dimensions

Phone
   - Space between content areas: 8dp
   - Screen edge left and right margins: 16dp
   - Content associated with an icon or avatar left margin: 72dp
Tablets : 
    - Screen edge left and right margins: 24dp
    - Space between content areas: 8dp
    - Status bar and space above list: 24dp
    - Content associated with an icon or avatar left margin: 80dp / 104dp(if there's an icon on toolbar aligned with left icons)

Respect these width/height ratios : 16:9 , 3:2 , 4:3 , 1:1 , 3:4 , 2:3

Screensizes qualifiers

- sw600dp : for devices whose smallest width is >= 600dp, ex. for a 7" tablet(ex. Nexus 7) 
- sw720dp : for devices whose smallest with is >= 720dp, ex. 1O" tablet(ex. Nexus 10)  
 and 
- small : almost 2 - 3 inch sizes : 426dp x 320dp
- normal : almost 3 - ~5 inch sizes : 470dp x 320dp 
- large : 4 - 7 inch sizes : 640dp x 480dp
- xlarge : 7 - 10 inch sizes : 960dp - 720dp