Set values in defined area on zero

Hey guys, I have this data file which creates the following plot:

I want the outliers between the two points where they cross zero to become zero. After I run my code i got this:

As you can see everything from the right of the MEAN-value is on zero but it seems like my code partially does not work because everything on the left is still there. Does anyone find the error? Or maybe someone has an easier way to erase the outliers? I attached the data file and I'm looking forward to your answers:)

[Stwiwi]

This is my code and I attached the data file

load 'USS_w3'

USS_w3_POS = USS_w3(USS_w3>0);
MEAN = 2.5*mean(USS_w3_POS);

a = 1;
for z=1:length(USS_w3)

      if USS_w3(a) < MEAN
          a = a+1;
      else
          c = a;
          while USS_w3(c) > 0
              c = c+1;
          end
          USS_w3(a:c) = 0;
      end
  end

a = 1;
for z=1:length(USS_w3)

      if USS_w3(a) < MEAN
          a = a+1;
      else
          c = a;
          while USS_w3(c) > 0
              c = c-1;
          end
          USS_w3(c:a) = 0;
      end
  end

Answer 1

[Matt J]

USS_w3( isoutlier(USS_w3,'ThresholdFactor',1.5)   )=0;

[Stwiwi]

That's nice, but i don't just want to set every value above this outlier value on zero but the whole curve which includes the outlier value.

[Matt J]

but the whole curve which includes the outlier value.

That would mean settings all your values to zero.