Summarization results on Space. Best system (shown in boldface) significantly outperforms all comparison systems, except where underlined ( p < 0.05; paired bootstrap resampling; Koehn, 2004). We exclude Oracle systems from comparisons as they access gold summaries at test time. RL_ASP is the Rouge-L of general summarizers against gold aspect summaries. AC and SC are shorthands for Aspect Coverage and Sentiment Consistency. Subscripts P and R refer to precision and recall, and F1 is their harmonic mean. MSE is mean squared error (lower is better).