EKFDMD are almost identical in (c) and (d).](pone.0000000.g000){#pone.0000000.g000}  ![Eigenvalues for multiple runs of a problem with a small number of DoFs with system noise, where the seed for the random number is different for multiple runs.](pone.0000000.g000){#pone.0000000.g000}  ![Errors in the eigenvalues for multiple runs of a problem with a small number of DoFs without system noise.](pone.0000000.g000){#pone.0000000.g000}  Then, 