Transverse structure and energy deposition by a subTW femtosecond laser in air: from single filament to superfilament oleh D Pushkarev, E Mitina, D Shipilo, N Panov, D Uryupina, A Ushakov, R Volkov, A Karabutov, I Babushkin, A Demircan, U Morgner, O Kosareva, A Savel’ev