NSTableView - How do I remove the horizontal gap between table cells

I am creating my own NSTableView for macOS. I can display formatted data and provide scrolling by embedding it in a ScrollView. When the table is displayed there is a horizontal gap between adjacent cells. The same gap occurs between the ScrollView header cells. I do not know how to. solve this problem. There is one other issue, I do not know how to set the vertical height of the ScrollView header cells. I would like to make them taller. Below is my code along with the test data.

struct ClosingValue: Identifiable {
    var id: UUID
    var name: String
    var date: String
    var close: Float
    
    static var closingValues = [
        ClosingValue(id: UUID(), name: "Stock1", date: "Nov 01, 2009", close: 1.10),
        ClosingValue(id: UUID(), name: "Stock1", date: "Nov 02, 2009", close: 2.10),
        ClosingValue(id: UUID(), name: "Stock1", date: "Nov 03, 2009", close: 3.10),
        ClosingValue(id: UUID(), name: "Stock1", date: "Nov 04, 2009", close: 4.10),
        ClosingValue(id: UUID(), name: "Stock1", date: "Nov 05, 2009", close: 5.10)
    ]
}

struct BetterTableView: NSViewRepresentable {
    
    class Coordinator: NSObject, NSTableViewDelegate, NSTableViewDataSource {
        
        @State var closingValues: [ClosingValue] = ClosingValue.closingValues
        
        func numberOfRows(in tableView: NSTableView) -> Int {
            closingValues.count
        }
        
        func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
            
            var nsView = NSView()
            let tableColumnWidth: CGFloat = 135
            
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.alignment = .center
            
            let attributes1: [NSAttributedString.Key: Any] = [
                .foregroundColor: NSColor.blue,
                .paragraphStyle: paragraphStyle,
                .font: NSFont(name: "Arial", size: 14.0) as Any
            ]
            
            switch tableColumn {
                
            case tableView.tableColumns[0]:
                tableColumn?.width = tableColumnWidth
                let attributedString = NSAttributedString(string: closingValues[row].name, attributes: attributes1)
                
                let tempNSView = NSTextField()
                tempNSView.backgroundColor = NSColor.white
                tempNSView.isBordered = true
                tempNSView.isEditable = false
                tempNSView.attributedStringValue = attributedString
                
                nsView = tempNSView
            case tableView.tableColumns[1]:
                tableColumn?.width = tableColumnWidth
                let attributedString = NSAttributedString(string: closingValues[row].date, attributes: attributes1)
                
                let tempNSView = NSTextField()
                tempNSView.backgroundColor = NSColor.white
                tempNSView.isBordered = true
                tempNSView.isEditable = false
                tempNSView.attributedStringValue = attributedString
                
                nsView = tempNSView
            case tableView.tableColumns[2]:
                
                tableColumn?.width = tableColumnWidth
                let closeAsString = String(format: "$%.2f", closingValues[row].close)
                let attributedString = NSAttributedString(string: closeAsString, attributes: attributes1)
                
                let tempNSView = NSTextField()
                tempNSView.backgroundColor = NSColor.white
                tempNSView.isBordered = true
                tempNSView.isEditable = false
                tempNSView.attributedStringValue = attributedString
                
                nsView = tempNSView
            default:
                print("problem in table view switch statement")
            }
            return nsView
        }
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator()
    }
    
    func makeNSView(context: Context) -> NSScrollView {
        
        let tableView = NSTableView()
        tableView.delegate = context.coordinator
        tableView.dataSource = context.coordinator
        tableView.addTableColumn(NSTableColumn())
        tableView.addTableColumn(NSTableColumn())
        tableView.addTableColumn(NSTableColumn())
        
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center
        
        let attributes: [NSAttributedString.Key: Any] = [
            .foregroundColor: NSColor.black,
            .paragraphStyle: paragraphStyle,
            .font: NSFont.systemFont(ofSize: 14)
        ]
        
        let column0AttributedString = NSAttributedString(string: "Stock", attributes: attributes)
        let column0Header = tableView.tableColumns[0]
        column0Header.headerCell.drawsBackground = true
        column0Header.headerCell.backgroundColor = NSColor.systemMint
        column0Header.headerCell.alignment = .center
        column0Header.headerCell.attributedStringValue = column0AttributedString
        
        let column1AttributedString = NSAttributedString(string: "Date", attributes: attributes)
        let column1Header = tableView.tableColumns[1]
        column1Header.headerCell.drawsBackground = true
        column1Header.headerCell.backgroundColor = NSColor.systemMint
        column1Header.headerCell.alignment = .center
        column1Header.headerCell.attributedStringValue = column1AttributedString
        
        let column2AttributedString = NSAttributedString(string: "Closing Value", attributes: attributes)
        let column2Header = tableView.tableColumns[2]
        column2Header.headerCell.drawsBackground = true
        column2Header.headerCell.backgroundColor = NSColor.systemMint
        column2Header.headerCell.alignment = .center
        column2Header.headerCell.attributedStringValue = column2AttributedString
        
        let scrollView = NSScrollView()
        scrollView.documentView = tableView

        
        return scrollView
    }
    
    func updateNSView(_ nsView: NSScrollView, context: Context) {
        let tableView = (nsView.documentView as! NSTableView)
        // work on this section
    }
}