fix headers

gistfile1.txt

# Get all .txt files in the current directory
Get-ChildItem -Filter *.txt | ForEach-Object {
    # Read the file content
    $filePath = $_.FullName
    $content = Get-Content $filePath
    
    # Split the first line by tabs and replace the first and second columns' headers
    $header = $content[0] -split "`t"
    $header[0] = "Measure:volume"
    $header[1] = "subject_000"
    
    # Join the modified header back with tabs
    $content[0] = $header -join "`t"
    
    # Write the updated content back to the file
    $content | Set-Content $filePath
}