PMC:7473770 / 6085-6246 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T30","span":{"begin":0,"end":161},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"However, problems with phase retrieval, phase wrapping, insufficient coherence, or on the contrary strong phase gradients can render its application challenging."}