Figure 3 displays the self entropy of four adaptation corpora along the X-axis, and the improvement in CER reduction when 72K-sentence adaptation data is used over when 800 sentences are used along the Yaxis.
for each adaptation method, each point in the figure corresponds to the CER reduction ratio on a domain (corresponding to Yomiuri, Encarta, TuneUp, Shincho from left to right) when 90 times more adaptation data was available.