awk , parse data from stacked columns

Shell Programming and Scripting
1

I am trying to rearrange stacked columns.

Below is an excerpt of my data file:
You can see there are two data columns stacked vertically.

                                                                                                                                    
ITERATION     Time        Ground
                         Distance

            seconds        feet
--------- ------------ ------------
        0       21.000      985.665
        1       21.150     1002.091
        2       21.300     1018.369
        3       21.450     1034.500
        4       21.600     1050.486
        5       21.750     1066.325
        6       21.900     1082.019                         

            Spoiler
                        Deflection

            seconds      degrees                                          
--------- ------------ ------------   
        0       21.000       70.800 
        1       21.150       70.800
        2       21.300       70.800
        3       21.450       70.800
        4       21.600       70.800 
        5       21.750       70.800 
        6       21.900       70.800

I am using gnuplot to plot the data and require the data columns to be beside each other laterally, not vertically. How can this be achieved with awk or sed?

2 
awk '
$1 ~ /^[0-9][0-9]*$/ && a[$1] {$1=$1; print $0, a[$1]}
{a[$1]=$2 " " $3}
' datafile
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