diff --git a/tp.gpt b/tp.gpt
index a0bd1ef..8c98e46 100644
--- a/tp.gpt
+++ b/tp.gpt
@@ -3,7 +3,7 @@
 #plot "tp.dat" using 1:3 title "input", "tp.dat" using 1:5 title "two pole", "tp.dat" using 1:6 title "34LAG", "tp.dat" using 1:7 title "78LAG"
 #plot "tp.dat" using 1:3 title "input" with linespoints, "tp.dat" using 1:5 title "two pole" with linespoints,  "tp.dat" using 1:7 title "78LAG" with linespoints,  "tp.dat" using 1:9 title "78LAG TWICE" with linespoints, "tp.dat" using 1:11 title "two pole 15 16"
 plot "tp.dat" using 1:3 title "input" with linespoints, "tp.dat" using 1:5 title "two pole" with linespoints, "tp.dat" using 1:11 title "two pole 15 16" with linespoints, "tp.dat" using 1:13 title "zero only" with linespoints
-plot "tp.dat" using 1:3 title "input" with linespoints, "tp.dat" using 1:5 title "two pole" with linespoints,  "tp.dat" using 1:15 title "zero only^2" with linespoints, "tp.dat" using 1:17 title "zero only^3" with linespoints,"tp.dat" using 1:19 title "zero only^4" with linespoints
+plot "tp.dat" using 1:3 title "input" with linespoints, "tp.dat" using 1:5 title "two pole" with linespoints,  "tp.dat" using 1:15 title "7 8 two pole ZG" with linespoints, "tp.dat" using 1:17 title "zero only^3" with linespoints,"tp.dat" using 1:19 title "zero only^4" with linespoints
 
 !sleep 10
 !sleep 10
diff --git a/two_pole_7_8.c b/two_pole_7_8.c
index 94323ca..91abe26 100644
--- a/two_pole_7_8.c
+++ b/two_pole_7_8.c
@@ -80,6 +80,9 @@ two_pole_7_8 ( int16_t input ) {
 }
 
 
+// Added zero guard. tried a pair of zeros near unit circle 
+// 7/8 in ADJ, i.e hyp = 1 so on unit circle.
+//
 int16_t /* squared version of LAG_7_8 */
 two_pole_7_8_zg ( int16_t input ) { // with zero guard
 
@@ -287,7 +290,7 @@ int main () {
 
 
 
-		zo2 = zero_only_2 (val);
+		zo2 = two_pole_7_8_zg(val); // zero_only_2 (val);
 		zo3 = zero_only_3 (val);
 		zo4 =  zero_only_4 (val);