GUIText Outline Shader

Hello,

I want that My GUI Text should have outline using shader. I have very much succeeded in this. The only problem I am getting is that I am getting fragments at the borders. I have attached an image of text. Also I am putting code for this shader. I have already pixel corrected my GUI Text.

Can anybody help me in this scenario. I am very new in the shader writing.

 Shader "GUI/Outline Text Shader" 
 {
     Properties 
     {
         _MainTex ("Font Texture", 2D) = "white" {}
         _Color ("Text Color", Color) = (1,1,1,1)
         _OutlineColor ("Outline Color", Color) = (120,120,120,255)
         _Outline ("Outline width", Range (0, 1)) = 0
     }
 
     SubShader 
     {
         Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
         Lighting Off Cull Off ZTest off ZWrite Off Fog { Mode Off }
         Blend SrcAlpha OneMinusSrcAlpha
 
         Pass {    
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             #pragma fragmentoption ARB_precision_hint_fastest
             #include "UnityCG.cginc"
 
             struct appdata_t {
                 float4 vertex : POSITION;
                 float2 texcoord : texcoord;
             };
 
             struct v2f {
                 float4 vertex : POSITION;
                 float2 texcoord : texcoord;
             };
 
             sampler2D _MainTex;
             uniform float4 _MainTex_ST;
             uniform float4 _Color;
             uniform float4 _OutlineColor;
             uniform float _Outline;
 
             v2f vert (appdata_t v)
             {
                 v2f o;
                 o.vertex = mul(UNITY_MATRIX_MVP , v.vertex );
                 o.texcoord = TRANSFORM_TEX(v.texcoord ,_MainTex);
                 return o;
             }
 
             float4 frag (v2f i) : COLOR
             {
                 float4 col = _Color;
                 float width = _Outline;
                 if(tex2D(_MainTex, i.texcoord).a < 1 && tex2D(_MainTex, i.texcoord).a > 0)
                 {
                     col = _OutlineColor ;
                 }
                 col.a *= tex2D(_MainTex, i.texcoord).a * 100;
                 return col;
             }
             ENDCG 
         }
     }     
     Fallback "GUI/Text Shader"
 }