Specifying distance between arrows in line SLD in GeoServer?

I have designed an SLD for a line format shapefile in GeoServer, in which I am using an arrow symbol as shown in figure.

The code is:

    xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" version="1.0.0">
    
        Blue arrows

        
            Blue arrows
            
                name
                
                    A blue line with end arrows
                    
                        
                            #73ed5d
                            3.26

                            bevel
                            square
                        
                    
                    
                        
                        
                            
                                
                                    

                                        shape://oarrow
                                        
                                            #0000FF
                                                                                            >0.5
                                        
                                        
                                                                                            >#0000FF
                                            
                                                >1
                                        
                                    
                                    20
                                
                            
                        
                    
                
            

        
    

I have to specify distance between this arrows.