Artificial I_{O VI λ1037} latitudinal profiles, synthesized from our models 1 (left) and 2 (right), assuming different oxygen abundances in the streamer closed region (core) relative to photospheric values. The profiles are taken along a line perpendicular to the streamer axis, at the height of the center of the streamer core, 1.75 ﹩R_{\odot }﹩ (left) and 2.0 ﹩R_{\odot }﹩ (right).