Also try to keep the trial results from stage 10 cm up to 10 times, and 300cm is the value of the plot a graph. I found that there is a slight error and crash to the stage more.
From the experimental results, try to collect from a distance 10cm to 300cm 10 times? Then the acquired plot graph. Found to have minor errors. And more mistakes on stage more.
Do try to keep from experimental results from stage 10cm until 300cm were 10 times the results were พล็อตก graph. Found guilty, little miss. More and more when the phase error .