FIG. 1 is a first perspective view of a concentrator photovoltaic unit showing our new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a left side view thereof;
FIG. 9 is an enlarged view of IX portion of FIG. 2;
FIG. 10 is an enlarged view of X-X portion of FIG. 5;
FIG. 11 is an enlarged view of XI-XI portion of FIG. 6;
FIG. 12 is an enlarged view of XII-XII portion of FIG. 6;
FIG. 13 is an enlarged view of XIII-XIII portion of FIG. 8;
FIG. 14 is a first referential alternate perspective view of the front;
FIG. 15 is an enlarged view of XV portion of FIG. 14;
FIG. 16 is a second referential perspective view of the front;
FIG. 17 is an enlarged view of XVII portion of FIG. 16;
FIG. 18 is a third referential alternate perspective view of the rear;
FIG. 19 is an enlarged view of XIX portion of FIG. 18;
FIG. 20 is a fourth referential perspective view of the rear;
FIG. 21 is an enlarged view of XXI portion of FIG. 20;
FIG. 22 is a fifth referential alternate perspective view of the rear;
FIG. 23 is an enlarged view of XXIII portion of FIG. 22;
FIG. 24 is a sixth referential alternate perspective view of the rear;
FIG. 25 is an enlarged view of XXV portion of FIG. 24;
FIG. 26 is a seventh referential alternate perspective view of the rear;
FIG. 27 is an enlarged view of XXVII portion of FIG. 26;
FIG. 28 is an eighth referential alternate perspective view of the rear; and,
FIG. 29 is an enlarged view of XXIX portion of FIG. 28.
The broken line portion of the figure drawings is included to show portions of the article and boundaries that form no part of the claimed design.