read_chk return a 2D data array
read_chk return a 2D data array


Former-commit-id: 81dfbc106450ff1e9b954dff6918c72cd38ed069 [formerly a133b99a458884c212d50659c667565148b81e22]
Former-commit-id: a7298f8e56d8a56ff80e78d53b9428cde1f750c7 [formerly 050a29f5558f55521ab554a30728fddc7a835d67]
Former-commit-id: 711e2f5d99cfc0339ede9bb7ad230f0b73a05008
simomarsili/elss