int mu4 = (int) (baseMu4 + MU_RECT_SIZE * (mu[3] + 1.5f) / 3.f);
gl.glBegin(GL_LINES);
gl.glVertex2i(mu3 - 4, mu4);
gl.glVertex2i(mu3 + 4, mu4);
gl.glVertex2i(mu3, mu4 - 4);
gl.glVertex2i(mu3, mu4 + 4);
gl.glEnd();
// info text
textRenderer.beginRendering(width, height);
textRenderer.draw(format("Epsilon %.5f - Max. Iter. %d", config.getEpsilon(), config.getMaxIterations()), 8, 10);