Please explain this graph step by step, I don't understand the expression of arrows and the number at all

The Comparative Advantage Argument AAACorp wants to borrow floating BBBCorp wants to borrow fixed Fixed 4.00% AAACorp BBBCorp Floating 6- month LIBOR - 0.1% 6-month LIBOR + 0.6% 5.20% 7.13 The Swap 4.35% 4% Corp BBBCorp LIBOR+0.6% LIBOR AAA pays libor - 0.35% BBB pays 4.95% both are better off by 25 bp 7.14