Sigma 34 and 36 Sigma 40 Sigma 36 Sigma 40 Pressure Panel Sigma 40 Sigma 40 Panel Sigma 34 and 36 Door open Sigma 34 and 36 Mattress in Gurney front out Sigma 34 and 36 Gurney out Sigma 36 Sigma 34 and 36 Gurney half front view Sigma Chamber – covered Sigma 36 Ventilation Panel Sigma 34 and 36 inside view low mattress Sigma 34 and 36 back view Sigma 34 and 36 Front Sigma 34 and 36 back view Sigma Chamber – covered Sigma 40 Ventilation Panel Sigma 34 and 36 Front Sigma 34 and 36 back view