PMC:7782580 / 13962-14118 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T103","span":{"begin":0,"end":156},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Figure 2a shows the mean image of each category and the five eigenvectors that represent the principal components of PCA in the corresponding feature space."}