Left­arm(hadron­arm) for Pi⁺, K⁺ proton :
 

 VDC: Vertical Wire Chamber

 S1: Trigger scintillator counter

 A1: 1st Aerogel Cerenkov counter, n = 1.015

A2: 2nd Aerogel Cerenkov counter, n = 1.055

GCs: Gas Cerenkov counter (short), n = 1.0004        not used

S2: Trigger scintillator counter

PR: Pion rejector                    not used

 
 

Right­arm(electron­arm) for e^-  and Pi^- :
 

 VDC: Vertical Wire Chamber

 S1: Trigger scintillator counter

 AM: Mirror aerogel counter, n = 1.025

 GC l : Gas Cerenkov counter (long), n = 1.0004

S2: Trigger scintillator counter

 PS: Pre­shower counters

 TS: Total shower counters