Monotone Data Visualization Using Rational Trigonometric Spline Interpolation

Figure 7

𝐶¹ rational trigonometric bicubic function with 𝛼_𝑖,𝑗=14,  𝛽_𝑖,𝑗=8,  𝛾_𝑖,𝑗=5,   𝛿_𝑖,𝑗=7,  𝛼_𝑖,𝑗+1=14,  𝛽_𝑖,𝑗+1=8,  𝛾_𝑖,𝑗+1=6,  𝛿_𝑖,𝑗+1=13,  𝛼_𝑖,𝑗=12, 𝛽_𝑖,𝑗=9,  𝛾_𝑖,𝑗=8,  𝛿_𝑖,𝑗=8,  𝛼_𝑖+1,𝑗=15,  𝛽_𝑖+1,𝑗=9,  𝛾_𝑖+1,𝑗=8, 𝛿_𝑖+1,𝑗=8.