Tuned the scatter in UVJ colors at high-z to better match the optical counts

Author: cschreib

src/egg-gencat.cpp

@@ -1123,7 +1123,10 @@ int main(int argc, char* argv[]) {
         // Calibrate "UVJ vector" from mass and redshift
         vec1f a0 = 0.58*erf(m-10) + 1.39;
         vec1f as = -0.34 + 0.3*max(m-10.35, 0.0);
-        vec1f a = min(a0 + as*z, 2.0) + 0.1*randomn(seed, m.size());
+        vec1f a = min(a0 + as*z, 2.0);
+        vec1d rnd_amp = 0.3*clamp(z-1.0, 0, 1)*clamp(1.0 - abs(m - 10.3), 0, 1)
+            + 0.1 + 0.05*clamp(z-1.0, 0, 1);
+        a += rnd_amp*randomn(seed, m.size());
 
         // Move in the UVJ diagram according to the UVJ vector
         double slope = 0.65;