diff --git a/tests/test_pauli_representation.py b/tests/test_pauli_representation.py
index 16793ff5..5c4eab61 100644
--- a/tests/test_pauli_representation.py
+++ b/tests/test_pauli_representation.py
@@ -8,8 +8,7 @@
 
 _PAULI_REPR = "(π/2) @ { I, X, Y, Z }\n(π/4) @ { X, X, Y, X }"
 
-SVG_CODE_PAULI = '<?xml version="1.0" encoding="utf-8"?>\n<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="610" height="200"><linearGradient id="ycolor" x1="0%" x2="100%" y1="100%" y2="0%"><stop offset="0%"  stop-color="#CCFFCC"/><stop offset="50%"  stop-color="#CCFFCC"/><stop offset="50%"  stop-color="#FF8888"/><stop offset="100%"  stop-color="#FF8888"/></linearGradient>\n<path fill="none" stroke="black" d="M 0, 130 L 10, 130"/>\n<path d="M 60 30 Q 63 81 30 120" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="10" y="120" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 0, 160 L 10, 160"/>\n<path d="M 60 30 Q 74 97 30 150" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="10" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 0, 190 L 10, 190"/>\n<path d="M 60 30 Q 84 112 30 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="10" y="180" width="20" height="20"/>\n<svg x="60" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π</text></svg>\n<path fill="none" stroke="black" d="M 0, 70 L 110, 70"/>\n<path d="M 160 30 Q 145 45 130 60" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="110" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 0, 100 L 110, 100"/>\n<path d="M 160 30 Q 153 64 130 90" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="110" y="90" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 30, 190 L 110, 190"/>\n<path d="M 160 30 Q 184 112 130 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="110" y="180" width="20" height="20"/>\n<svg x="160" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/2</text></svg>\n<path fill="none" stroke="black" d="M 130, 70 L 210, 70"/>\n<path d="M 260 30 Q 245 45 230 60" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="210" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 30, 160 L 210, 160"/>\n<path d="M 260 30 Q 274 97 230 150" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="210" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 130, 190 L 210, 190"/>\n<path d="M 260 30 Q 284 112 230 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="210" y="180" width="20" height="20"/>\n<svg x="260" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/256</text></svg>\n<path fill="none" stroke="black" d="M 230, 70 L 310, 70"/>\n<path d="M 360 30 Q 345 45 330 60" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="310" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 130, 100 L 310, 100"/>\n<path d="M 360 30 Q 353 64 330 90" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="310" y="90" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 30, 130 L 310, 130"/>\n<path d="M 360 30 Q 363 81 330 120" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="310" y="120" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 230, 160 L 310, 160"/>\n<path d="M 360 30 Q 374 97 330 150" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="310" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 230, 190 L 310, 190"/>\n<path d="M 360 30 Q 384 112 330 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="310" y="180" width="20" height="20"/>\n<svg x="360" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/8</text></svg>\n<path fill="none" stroke="black" d="M 330, 70 L 410, 70"/>\n<path d="M 460 30 Q 445 45 430 60" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="410" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 330, 100 L 410, 100"/>\n<path d="M 460 30 Q 453 64 430 90" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="410" y="90" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 330, 190 L 410, 190"/>\n<path d="M 460 30 Q 484 112 430 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="410" y="180" width="20" height="20"/>\n<svg x="460" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/4</text></svg>\n<path fill="none" stroke="black" d="M 430, 70 L 510, 70"/>\n<path d="M 560 30 Q 545 45 530 60" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="510" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 330, 160 L 510, 160"/>\n<path d="M 560 30 Q 574 97 530 150" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="510" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 430, 190 L 510, 190"/>\n<path d="M 560 30 Q 584 112 530 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="510" y="180" width="20" height="20"/>\n<svg x="560" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/2</text></svg>\n<path fill="none" stroke="black" d="M 530, 70 L 610, 70"/>\n<path fill="none" stroke="black" d="M 430, 100 L 610, 100"/>\n<path fill="none" stroke="black" d="M 330, 130 L 610, 130"/>\n<path fill="none" stroke="black" d="M 530, 160 L 610, 160"/>\n<path fill="none" stroke="black" d="M 530, 190 L 610, 190"/>\n</svg>'
-
+SVG_CODE_PAULI = '<?xml version="1.0" encoding="utf-8"?>\n<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="610" height="200"><linearGradient id="ycolor" x1="0%" x2="100%" y1="100%" y2="0%"><stop offset="0%"  stop-color="#FF8888"/><stop offset="50%"  stop-color="#FF8888"/><stop offset="50%"  stop-color="#CCFFCC"/><stop offset="100%"  stop-color="#CCFFCC"/></linearGradient>\n<path fill="none" stroke="black" d="M 0, 130 L 10, 130"/>\n<path d="M 60 30 Q 63 81 30 120" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="10" y="120" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 0, 160 L 10, 160"/>\n<path d="M 60 30 Q 74 97 30 150" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="10" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 0, 190 L 10, 190"/>\n<path d="M 60 30 Q 84 112 30 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="10" y="180" width="20" height="20"/>\n<svg x="60" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π</text></svg>\n<path fill="none" stroke="black" d="M 0, 70 L 110, 70"/>\n<path d="M 160 30 Q 145 45 130 60" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="110" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 0, 100 L 110, 100"/>\n<path d="M 160 30 Q 153 64 130 90" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="110" y="90" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 30, 190 L 110, 190"/>\n<path d="M 160 30 Q 184 112 130 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="110" y="180" width="20" height="20"/>\n<svg x="160" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/2</text></svg>\n<path fill="none" stroke="black" d="M 130, 70 L 210, 70"/>\n<path d="M 260 30 Q 245 45 230 60" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="210" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 30, 160 L 210, 160"/>\n<path d="M 260 30 Q 274 97 230 150" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="210" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 130, 190 L 210, 190"/>\n<path d="M 260 30 Q 284 112 230 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="210" y="180" width="20" height="20"/>\n<svg x="260" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/256</text></svg>\n<path fill="none" stroke="black" d="M 230, 70 L 310, 70"/>\n<path d="M 360 30 Q 345 45 330 60" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="310" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 130, 100 L 310, 100"/>\n<path d="M 360 30 Q 353 64 330 90" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="310" y="90" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 30, 130 L 310, 130"/>\n<path d="M 360 30 Q 363 81 330 120" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="310" y="120" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 230, 160 L 310, 160"/>\n<path d="M 360 30 Q 374 97 330 150" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="310" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 230, 190 L 310, 190"/>\n<path d="M 360 30 Q 384 112 330 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="310" y="180" width="20" height="20"/>\n<svg x="360" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/8</text></svg>\n<path fill="none" stroke="black" d="M 330, 70 L 410, 70"/>\n<path d="M 460 30 Q 445 45 430 60" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="410" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 330, 100 L 410, 100"/>\n<path d="M 460 30 Q 453 64 430 90" fill="none" stroke="black"/>\n<rect fill="#CCFFCC" stroke="black" x="410" y="90" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 330, 190 L 410, 190"/>\n<path d="M 460 30 Q 484 112 430 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="410" y="180" width="20" height="20"/>\n<svg x="460" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/4</text></svg>\n<path fill="none" stroke="black" d="M 430, 70 L 510, 70"/>\n<path d="M 560 30 Q 545 45 530 60" fill="none" stroke="black"/>\n<rect fill="#FF8888" stroke="black" x="510" y="60" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 330, 160 L 510, 160"/>\n<path d="M 560 30 Q 574 97 530 150" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="510" y="150" width="20" height="20"/>\n<path fill="none" stroke="black" d="M 430, 190 L 510, 190"/>\n<path d="M 560 30 Q 584 112 530 180" fill="none" stroke="black"/>\n<rect fill="url(#ycolor)" stroke="black" x="510" y="180" width="20" height="20"/>\n<svg x="560" y="10" height="20" width="50"><rect x="0" y="0" width="100%" height="100%" stroke="black" fill="white" stroke-width="5 %"/><text x="50%" y="50%" width="100%" height="100%" font-size="100%" dominant-baseline="middle" text-anchor="middle" >π/2</text></svg>\n<path fill="none" stroke="black" d="M 530, 70 L 610, 70"/>\n<path fill="none" stroke="black" d="M 430, 100 L 610, 100"/>\n<path fill="none" stroke="black" d="M 330, 130 L 610, 130"/>\n<path fill="none" stroke="black" d="M 530, 160 L 610, 160"/>\n<path fill="none" stroke="black" d="M 530, 190 L 610, 190"/>\n</svg>'
 
 class TestPauliConversion(unittest.TestCase):