Portion of the Hα continuum-subtracted image of M 101 presented by Cedrés & Cepa (2002) showing the H ii region H 1013. The apertures corresponding to the optical and infrared spectra used in this study are also indicated for reference: the long narrow one corresponds to the LRIS data, the short narrow one to the HIRES data, and the wide one to the mid-infrared observations (note that the slit orientation is arbitrary).