Table:
text: Choke (firearms)
Constriction
Constriction
Choke Constriction_Inch Percentage_of_lead_shot_in_30_inch_circle_at_40_yards Identification_Notches Identification_Stars_Spanish_shotguns_
Cylinder 0.000 40 at 40 yd , 70 at 25 yd IIIII notches ***** stars
Skeet 1 0.005 45 at 40 yd , 75 at 25 yd  
Improved  Cylinder 0.010 50 IIII notches **** stars
Skeet 2 (light Mod.) 0.015 55  
Modified 0.020 60 III notches *** stars
Improved Modified 0.025 65 II notches ** stars
Full 0.030 70 I notch * star
Extra Full 0.040 73 I notch 
Turkey 0.045 plus 75 plus I notch

Question: Which choke has the smallest constriction among the chokes (firearms)?