spacing of gui letters

Unity Engine
1

Hi there guys, I will try to explain as well as I can.

I have 2 cameras. the one is the main background and the 2nd generates a square window, used to display a graph. on the 2nd graphCamera I have 2 scripts, one that set the normalized settings for the camera and one that generates numbered ticks for the graph’s x and y axis. here is the main part of the script for the camera viewport settings:

if (isSquare)
        {
            aspect = (float)Screen.width / (float)Screen.height;
            height = squareHeight;
            width = height / aspect;
            normalizedRect = new Rect(leftEdge, bottomEdge, width, height);
            camera.rect = normalizedRect;
        }
        else
        {
            normalizedRect = new Rect(leftEdge, bottomEdge, width, height);
            camera.rect = normalizedRect;
        }

…and here is the code for generating the ticks…

void Update()
    {

        xTicksIntervals = Screen.width * buildWindow.width / nrOfTicksX;
        yTicksIntervals = Screen.height * buildWindow.height / nrOfTicksY;

        //sets the x and y-position for the ticks on the x-axis
        lowTickX = camera.ViewportToScreenPoint(new Vector2(0.025F, 0.475F));
        
        //sets the x and y-position for the ticks on the y-axis
        lowTickY = camera.ViewportToScreenPoint(new Vector2(0.475F, 0.015F));

    }

    void OnGUI()
    {

            for (int i = 0; i <= nrOfTicksX; i++)
            {
                GUI.Label(new Rect(lowTickX.x + i * xTicksIntervals, lowTickX.y, 15, 15), xTicks[i].ToString());
                GUI.Label(new Rect(lowTickY.x, lowTickY.y + i * yTicksIntervals, 15, 15), yTicks[i].ToString());
            }

    }

This actually works in a way, but when I resize the window, the total width of all the ticks is slightly wider than the viewport. Is there a better or more reliable way of doing this. All I actually need is the width of the viewport in pixels devided by the number of ticks…

Thanks in advance

2

anyone?