ZJ.GRAW    -0.7964    0.0051    0.9690    0.0139    0  GRAW.BHZ   301.1263    -1.8041

##</code><code>##

#!/usr/bin/env perl

use strict;
use warnings;

print scalar <DATA> for 1 .. 2;

my @zj_lines;

while (<DATA>) {
    if (/ \A Mean_arrival_time: \s+ ( \S+ )/x) {
        output_recalc_zj_lines(\@zj_lines, $1);
        print;
        last;
    }
    
    push @zj_lines, $_;
}

print <DATA>;

sub output_recalc_zj_lines {
    my ($zj_lines, $mean) = @_;

    for (@$zj_lines) {
        s/ ( \S+ ) ( \s+ ) \z / $1 - $mean . $2 /ex;
        print;
    }
}

__DATA__
 MCCC processed: unknown event at: Tue, 14 Oct 2014 12:02:26 CST 
station, mccc delay,    std,    cc coeff,  cc std,   pol   , t0_times  , delay_times
 ZJ.GRAW    -0.7964    0.0051    0.9690    0.0139    0  GRAW.BHZ   301.1263    -1.8041
 ZJ.KNYN     -0.7065    0.0072    0.9760    0.0133    0  KNYN.BHZ   301.3372    -1.9249
 ZJ.LEON      0.9675    0.0072    0.9548    0.0292    0  LEON.BHZ   301.2611    -0.1749
 ZJ.RKST     -0.2061    0.0114    0.9404    0.0383    0  RKST.BHZ   301.3500    -1.4374
 ZJ.SHRD      0.4382    0.0051    0.9542    0.0351    0  SHRD.BHZ   301.7360    -1.1791
 ZJ.SPLN      0.3033    0.0051    0.9785    0.0126    0  SPLN.BHZ   301.0760    -0.6541
Mean_arrival_time:   300.1187 
No weighting of equations. 
Window:   2.23   Inset:   1.17  Shift:   0.25 
Variance: 0.00645   Coefficient: 0.96215  Sample rate:   40.000 
Taper:   0.28 
Phase: P        
PDE    2013  7 15 14  6 58.00   -60.867   -25.143   31.0  0.0  7.3 

##</code><code>##

$ pm_1126698_split_record.pl
 MCCC processed: unknown event at: Tue, 14 Oct 2014 12:02:26 CST 
station, mccc delay,    std,    cc coeff,  cc std,   pol   , t0_times  , delay_times
 ZJ.GRAW    -0.7964    0.0051    0.9690    0.0139    0  GRAW.BHZ   301.1263    -301.9228
 ZJ.KNYN     -0.7065    0.0072    0.9760    0.0133    0  KNYN.BHZ   301.3372    -302.0436
 ZJ.LEON      0.9675    0.0072    0.9548    0.0292    0  LEON.BHZ   301.2611    -300.2936
 ZJ.RKST     -0.2061    0.0114    0.9404    0.0383    0  RKST.BHZ   301.3500    -301.5561
 ZJ.SHRD      0.4382    0.0051    0.9542    0.0351    0  SHRD.BHZ   301.7360    -301.2978
 ZJ.SPLN      0.3033    0.0051    0.9785    0.0126    0  SPLN.BHZ   301.0760    -300.7728
Mean_arrival_time:   300.1187 
No weighting of equations. 
Window:   2.23   Inset:   1.17  Shift:   0.25 
Variance: 0.00645   Coefficient: 0.96215  Sample rate:   40.000 
Taper:   0.28 
Phase: P        
PDE    2013  7 15 14  6 58.00   -60.867   -25.143   31.0  0.0  7.3