PA correction -0.2% because we're at a 1000ft

Temp correction: at 1000ft ISA temp is 13*C actual temp is 17*C. 4*C difference = correction of 4 x -0.1=0.4%

Wing anti ice -1%

Eng anti ice -0.5%

Total correction = 2.1%

Initial gradient 6% - total correction 2.1% = 3.9%