What Is The Pixel Spacing of the result from SLC to GRD in s1tbx?

Hello, I am working on the Sentinel-1A SLC data recently. Today, I have a problem about the pixel spacing of the GRD product which is transformed from the SLC using the tool in s1tbx “SLC to GRD”. The range look number is set as the default value, which is 4. Now, I do not know the pixel spacing value. Can somebody help me?