I created a gpu_ray sensor, with 4 beams, why am I only getting 2 different numbers?

edit

So I am trying to construct a sensor that has 4 beams that are outward from vehicle. So I created a sensor with 2 horizontal samples, and 2 vertical samples. The problem is when I loop through the ranges, even if I have the beams tilted against the ground, so I should get 4 very different ranges, I get the first 2 that are very close, and the second 2 are very close. Am I misunderstand something with regards?

         <ray>
            <noise>
              <type>gaussian</type>
              <mean>0.0</mean>
              <stddev>0.02</stddev>
            </noise>
            <scan>
              <horizontal>
                <samples>2</samples>
                <resolution>1</resolution>
                <min_angle>-0.5236</min_angle>
                <max_angle>0.5236</max_angle>
              </horizontal>
              <vertical>
                <samples>2</samples>
                <resolution>1</resolution>
                <min_angle>-0.5236</min_angle>
                <max_angle>0.5236</max_angle>
              </vertical>
            </scan>
            <range>
              <min>1</min>
              <max>100</max>
              <resolution>0.1</resolution>
            </range>
          </ray>


 for (int i = 0; i < this->parentSensor->RangeCount() * this->parentSensor->VerticalRangeCount(); i++)
  {
    ss << "," << this->parentSensor->Range(i);
  }