rfmig_mboot.f -- code to compute RF harmonic expansion in back-azimuth, moving-window moveout correction

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c program rfmig_mboot
c 10/12/04 JJP -- adapted from rfmigrate
c
c xf77 -o /park/backup/bin/rfmig_mboot rfmig_mboot.f /park/backup/Plotxy/plotlib.a /park/backup/Ritz/eislib.a /park/backup/Ritz/jlib.a
c xf77 -o /Users/jjpark/bin/rfmig_mboot rfmig_mboot.f /Users/jjpark/Plotxy/plotlib.a /Users/jjpark/Ritz/eislib.a /Users/jjpark/Ritz/jlib.a
c
c computes moving-window moveout correction for MTC receiver functions
c applied in the frequency domain.
c requires a stacking model in the anirec format
c such a model may have anisotropy parameters,
c but migration code only uses the isotropic velocities.
c
c nboot=0 -- only compute a single regression for RF harmonic expansion --> no bootstrap uncertainty estimate
c
c code computes frequency-domain stacks of receiver functions that follow a harmonic expansion in baz
c for both radial and transverse RFs there are constant terms and sin/cos terms for 2- and 4-lobed
c amplitude dependence. The constant term should be zero for the transverse RF.
c The 2-lobed terms govern dipping interface effects and tilted symmetry-axis ansotropy.
c The 4-lobed term is anisotropy with a horizontal axis
c The code regresses for the harmonic expansion, and bootstrap-resamples the data to estimate the
c uncertainty of the harmonic terms.
c
c output files are out[rt]_bexp.grid -- harmonic-expansions of the RFs, in time domain
c out[rt]1_bexp.grid -- harmonic-expansion RFs plus bootstrap uncertainty
c out[rt]2_bexp.grid -- harmonic-expansion RFs minus bootstrap uncertainty
c out[rt]_bbaz.grid -- harmonic-expansion RFs computed for ordered baz values
c
c has kluge to cheat the pre-event noise for synthetic records 3/12/00 JJP
c check to see if the kluge is commented out