Anyway, the argyle graph you see here can be found in the Danish journal Spring: Tidsskrift for moderne dansk litteratur, number 18, 2002. The whole issue is devoted to the late Inger Christensen; the article from which the image is taken is by Rikke Toft Nørgård: "Mirakler for realister: En analyse af 'Brev i april.'" The graph (labelled Fig. 1) is on p.146. You can access that issue online by clicking here.