1E1207.4-5209: Lines vary in phase
Comparison of 4 PN
spectra at different phase intervals.
Residuals of the phase-dependent spectra
from the two- blackbody continuum fit.
ÿ The peak of the
total light curve corresponds to the phase-interval where absorption lines are at
their minimum;
ÿ Lines are more important at the light
curve trough.