High-end 30cm-cubic ETCC (Ar or CF4 2-3 atm) Similar ETCC to that in SMILE-II+ (ETCC detector with 2 atm Ar launched in JAXA Balloon Experiment in 2018 Spring) Detection Area similar to 2” × 2” Ge PSF <5° at Half Power Radius Size ∼50 × 50 ×50 cm
