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We present a list of interstellar absorption lines in the direction of HD37061 in the M 43 nebula. Some of the absorption lines arise from atomicexcited levels that are uncommon in interstellar clouds. The excited levels ofFe II are populated by fluorescence. We found a large number of H2 molecularabsorption lines arising from vibrationally excited levels. The ortho/para H2ratio is equal to 2.7. The H2 rotational temperature of vibrational levels 1 -5 exceeds 2000 K.

Interstellar medium in the M 43 nebula