PMC:7473770 / 39634-39792 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T311","span":{"begin":0,"end":158},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"When available, projections recorded at several defocus distances were first aligned with sub-pixel accuracy and then used for multi-distance phase retrieval."}